I'm a little more savvy on the old board than mixing in the box, so when I have time I try to send my arranged tracks to my mixing board to sum to stereo, and a few other sources. I'd like to think it "analogifies" the signal somehow.
Here are a few things I do:
Group and divide all tracks on my computer to 8 sends, plugins and surgical eq applied > Send all 8 track through the Outs on my Ensemble to my Mackie 1402 > Apply some sweeping/asthetic eq, pan, and sum down to a stereo track using the master outs > Send back to the Ensemble as a stereo track.
I have an old refurbished TASCAM Syncaset 238. The tapeheads are seeing the end of their days, but the RCA In/Outs work just fine. I sometimes send the 8 sends into the machine, letting it run through the analog circuit to get "colored", then bounce the tracks to the Mackie. I have yet to try the same with a Stereo tape deck. That might be cool.
Anyway, that's what I do to try and "warm up" my tracks, so to speak. When it comes down to it, if you like the sound, man, then go with it. I'm happy with the sound for the most part, but there's always room for improvement =)