A lot of absolute drivel on that Porktalk thread.
It would take too long to detail the number of clubs that took the 'East Bank' before segregation. The problem that Wednesday have always had is that they never had levels of support commensurate with the capacity of the ground, and consequently, any club arriving in Sheffield with a decent following could and did take their end. They simply didn't have the numbers to defend it. Obviously, certain clubs - principally Man U and Leeds - took it every year as a matter of course, but some ostensibly less naughty outfits like Wolves, Leicester, and Birmingham helped themselves. Embarrassing.
As for the Blades, Easter Monday in 1970/71 promotion season springs immediately to mind, when the East Bank was red and white literally from corner to corner. The home fans were hiding in the stands that day.
The League Cup match under Warnock was also notable for there being so many United fans in the North Stand, that the Police decided that they wouldn't throw them out and instead just moved them into the side nearest Leppings Lane and put a line of Police between the opposing (this is the game of which their OCS spokesman, Douggie said, on "Football Factories", "there were thousands of 'em; quite frightening really").