Because of the way my DAW works (CEP2.1), I do this [“mult” = parallel] every mix, and I do it with compression and verb.
I typically use a limiter and edit the original vocal track for clicks and pops at the same time, going thru and leveling the volume (I usually have to bring up some syllables, sometimes spot de-ess, etc.) I can usually edit a 3.5 minute lead vocal in about 5 or so minutes, after monitoring the playback a few times while overdubbing other stuff.
Then in mixdown, I like a fairly fast compressor taking it down about 4-7 db (I initially record with opto and/or 1176 hardware comps). I parallel that software-compressed track with the unprocessed track and also with a parallel verb (typically a plate setting), often having about 60% vs. like 20% and 20% – as a start, then I tweak to the final mix.
I like to mix from a typical starting position, and then adjust as the mix comes along; the above is how I start, using the same fast compressor and a small plate. I thereafter might vary the compression, the reverb, add delay, adjust EQ … I find that if I start this way with a known, lightly-processed lead vocal sound, I can more readily hear what the mix “needs”, ex., a bigger reverb, a brighter EQ, a touch of distortion, etc.
YMWPV