in max4 if you option-drag on an object box to make a new object, you can just start typing to rename it. . .
in max5 you have to select the object box to type in a new object name.
this may seem like a little thing. . . but you know, we all find our ways of working quickly, and suddenly i feel sooooo clunky making my patches!!
i haven't done so much max5 stuff yet, but this stands out right away as something that slows me down .