This is something I'm starting to think sounds good on paper, but more often than not doesn't matter in a typical game. What I usually see happen is something along the lines of:
1. Dude AoEs the creeps.
2. Hangs back while wave pushes to the tower.
3. Tower gets all the kills and pushes it back.
4. Rinse, repeat.
Kind of how harrass is theoretically important, but most of the time champs have enough regen to make it a waste of time.