T.C.
They are limited in the number of toys they can bring out, but it can still get pretty messy. If we are going to do some sort of project or something fun, they have to clean up the front areas first. We always clean before hubby gets home. And, the playroom always gets cleaned before bed.
So, usually the front area gets cleaned twice, then the playroom once. Sometimes the front area reaches too messy and we clean (cluttered is okay, but if it gets very bad, it's clean up time, no matter what).
I don't have the energy to clean up after them as they go. That would mean I'd be cleaning all day long and getting nothing else done;-) When they are really little, they have limited amount of toys and that helps in fast clean up.