When I have alot of automation on a track, Ill slap this gain plug in on there to either turn up or down the channel in volume. Volume control without messing with your automation. I can dig it.
Although personally I'm not always a fan of stock plugins, The Logic Gain Control is great for when an instrument is too loud even when the valume fader is at near minus infinity. It's a life saver when needing to shave off a couple decibels or even adding some on if it's too quiet.