Sense 3.6 is about the same as 3.5, so it's not a lot different (dock). Sense4 on the other hand. 4 makes me like sense again. My only complaint is the 4x4 everything. So stupid. My Hero was 4x4. Anywho. Stock ICS is all fine, and fast and dandy, but it's not perfect. The senseless roms I still put Nova launcher on, and ICS+ browser, a better music widget, calender widget... you get what I'm saying. The one thing I think is brilliant on sense4 is adding widgets. It's 1000% better than any other way, they added flash support for the browser and an [UL]incognito mode (unsure if those on in vanilla).[/HL] Lockscreen is better because you can do stuff besides unlock the phone.
But who cares, if your waiting for official ICS, it's probably 3.6, so you are not gonna be as happy as me, sorry.