I use a Beseler or similar continuous, reversing rotary agitator for the first 30 seconds of development and every other step (pre-rinse, stop bath, fixer, rinse, HCA) except the wash.
In addition to reducing the volume of chemistry required, that means, for all those steps:
1) my agitation regime is essentially the same for each and every roll of film; and
2) it frees me up to do other things while the tank is on the agitator, I can be prepping the following chemicals, or doing the necessary housekeeping steps to speed clean-up and put away at the end of the session. That means more to us who have temporary darkroom facilities than it might for someone with a dedicated space - I use the kitchen to develop film.
The Paterson Super System 4 tanks that are sized to hold three 135 reels or two 120 reels work perfectly for this - just need to add a thick rubber band to keep the tank centred.
I could use the agitator for the entire development stage, but my preference for developing two 120 films on the same reel means that that doesn't work well, because when I do that films seem to want to migrate and overlap in the reels during the development step. That doesn't seem to happen during the other steps.
I can even do this with steel reels - if I can put up with the noise