I used to think as you do mixing everything to stereo in one shot. It's straightforward and convenient. But it's a destructive process, meaning you can never go back and revise what has been done and have to start over.
Anyway, I too used to use a 3630 during those times. This compressor is a general workhorse designed for all sorts of uses for vocals, drums, bass, you-name-it. And for clamping down on levels and providing some pump. But doesn't really have that warm, breathing mojo everyone is out looking for. I've always eyed-up the RNC but ended up building a GSSL, a clone of the SSL mixbus. And now I mostly use the UAD clone of the 33609 for recording and I use it religiously.
Back to the 3630 and -the gate- which is quite decent for something in this price range. I used to mess around with the gate to get those Phil Collins reverb-y drum stops. I also used to chop up chord stabs, bass riffs, and arpeggios with that gate. Good times. Even if you're not doing techno with the 3630, you may want to try the sidechain for the drums and bass to keep the lows from getting too muddy.