I looked this up the other day: evidently, other than LeBron-lead teams*, since 06-07 there have been a grand total of 4 teams in the East who've finished with 60+ wins. Two of those are big 3 Boston teams -08 & 09- the other two are the 11 Bulls w/ mvp Rose and the 15 Hawks (and that team was fucking trash). The Bulls hit an equivalent win percentage in the 12 lockout season.
By comparison, 12 different teams in the west have 60 win seasons in that same time span. San Antonio alone has like 5 of them along with an equivalent win percentage in 2012.
*for reference, LeBron's teams hit 60 wins in 09, 10, & 13