I use VariAudio, native to Cubase. I use it when it is needed to make the song sound better overall. Never to the degree that it can be heard (go ahead and debate that one, I could give two shits). I also comp together my drum parts, my bass parts and my guitar parts. I record all of my keyboard parts in midi and tweak the fuck out of them. See, when you bust you ass for other people all day you gotta do what it takes to get it put together in the couple hours left at the end of the day. Use your tools but don't abuse your tool.