Besides BoP I've not played many proper sims for a long time (RacePro on xbox can probably be reguarded a sim in the similar vein to BoP is I suppose).
Going by hours played my most used sim is most probably
Gunship so long ago I can hardly remember. I probably should play more sims but as with everything now I have kids time and money are both major limiting factors.
I'd like to think of Rainbowsix & Rogue Spear as "simulators" but I'm sure the hardcore would disagree.