I remember quite a few games in RBWs ending in feudal, and many DMWC matches going quite long.I don't think so, as there is no time limit on the ladder and it's basically just a normal RM game with a later start. Games can still go to post-imp if people start (stone-) walling early enough (minute 1-3).
A fast game mode I can think of is Dark Age EW start, Fast Speed and maybe time limit like 45 minutes or so. If you want fast paced games like in SC2 for example you would need fixed-mirrored maps/non-random maps, much smaller, with relatively fixed TC positions, even for expansions I think and spaces where resources are that are heavily fight for. I'm actually eager to see how that would work out for aoe2de, tbh.