Maybe so, but I remembered a
cricinfo article:
On the eve of the match the newspapers were predicting a "true and lasting" pitch suited to fast bowling. England's selectors were unsure who to leave out, but in the end Fred Trueman was omitted, partially because of doubts about the weather and also because Australia had been all at sea against spin in the previous Test at Headingley where England had won by an innings and Laker and Tony Lock had taken 18 wickets between them. Despite this, the general feeling was that the game would be a draw - no Ashes Test at Old Trafford had produced a result since 1905.
However, Australian suspicions that the pitch had been prepared for the England spinners were confirmed years later when Bert Flack, the Manchester groundsman, said on the day before the start he had been instructed by Gubby Allen, the chairman of England's selectors, to shave the pitch. "That's stupid," Flack replied. "The match won't last three days. The surface is not that well knit." After pondering for a few minutes, Flack did as he had been ordered and immediately covered the pitch to prevent the press from seeing what he had done.
England ended the first day on 307 for 3, with Peter Richardson, who opened with Colin Cowdrey, scoring his maiden Test hundred. But he too was surprised at what greeted him when he walked out to bat. "[The pitch] looked totally different to how it looked the night before," he said. 'When we arrived it looked lush green, perfect for seamers. Next morning, it had been shaved right down. It looked cooked. I don't know if it was deliberately done but it certainly helped our chances of winning. It's still being discussed by the old fuddy-duddies but none of us knew what really happened with it."
Loads of things are a both/and proposition. For example, no-one disputed that Australia batted crummily regardless of the pitch (though the last 8 wickets were taken on a drying pitch after rain).
As for the other bowlers, the opinions of the article (including cricket's Mr Opinion of the 50s):
In his wake trailed a bewildered Lock. He had bowled one over more than Laker and finished with match figures of 1 for 106. The consensus was that he had bowled too fast. "He lacked the power or the patience," noted John Arlott.
Trevor Bailey was to the point. "I don't think they had a price from the word go," he said. "We played on a beach and it became muddy as well because the rain came down. We were well equipped for a beach because we had two great spin bowlers. They had two reasonable spinners but certainly not bowlers who were likely to be really difficult on this type of wicket."
Not all spin bowlers are equal, as we've seen in India and Sri Lanka whether or not they were doctoring their pitches (Certainly, S.Africa couldn't have had too many complains the last time they toured). Johnson only took five wickets in a
match 4 times in 45 tests, and Benaud was playing in his 22nd test at that point and had taken five in a match only twice: in his next 41 tests he would do so 22 times (I think he spent a long part of his early career 'finding' his bowling, being somewhat more preferred for batting). So Laker was the only one to exploit the conditions and to amazing effect, but that doesn't mean other aspects are beyond consideration.
Johnson was also known for his diplomacy, part of the reason he was chosen as captain of Australia. In a Jack Fingleton book, he unintentionally comes off as kind of an idiot with regards to the chucking controversy (although he anticipated the 'everyone does it' brigade by about forty years) but his approach fitted in with his character.
Unfortunately, this is the only copy I could find of the picture of the pitch being swept before Australia's 1st innings:
However, Pathe have footage that although showing none of the wickets, does show part of Australia's 2nd inns in a resolution high enough to actually see the ball (although their cameraman could have done with a few tips on appropriate use of the zoom):
This being Pathe, they only show two of the ten wickets in their finished newsreel.