Here's the content I soloed back at 85 as prot:
All level 60 raids except Razorgore in BWL (due to mechanics), Bug Trio/Viscidus/Twins/C'thun in AQ40 (again, mechanics).
Full Karazhan, Gruul's Lair, 4/4 TK, 4/6 SSC (Karathress and Vashj are pain in the ass), Supremus/Akama/Bloodboil/Gorefiend/Shahraz. Haven't tried Hyjal/Sunwell since there was nothing intersting there for me.
Naxx-10: Plague wing, Spider wing, Patchwerk, Grobbulus, Sapphiron.
Malygos-10, Onyxia-10, Sartharion-10 without drakes (duo-d trash with a friend).
Didn't bother with Ulduar or anything past it, since it felt impossible. Might give it a try at 90.
The only raid I attempted at 90 was TK (continuing to farm phoenix), and I'm just skipping all bosses and rushing to Kael. He's piss easy now, my yesterday's kill was 7:56 and it could've been faster if I didn't play extremely safe and waited for cooldowns between phases. Done in Ret.