There are interesting things you can do by working in stereo. I've recently converted after always going mono since I started playing guitar (because guitar amps are mono).
I would start just by adding a stereo reverb at the end of your chain. Use one of the relatively tame ones, at least at first (Ambience, Music Hall, Recording Studio A/C, Small Hall, Small Room, etc.). Make sure you're actually monitoring in stereo and that you have a good stereo setup for your speakers.
One of the best things you can do is adjust your speaker position until your system will pass
LEDR. If you have things set up, yes, the chirpy sounds will move like it describes. Yes, headphones/IEMs will pass too, but you have to use an HRTF plugin to get it to work (which also entails monitoring through a computer). But, they go a long way toward realism.
It's worth checking the mono sum somewhat extensively to make sure you're not losing anything vital if you have to downmix to mono (which you would do with some combination of the stereo spread on the reverb and the output mode in the setup menu). Or having mono and stereo versions of your presets so you can just pick which version of your presets you use for each gig.
But....there are other fun things...they do depend on your FOH engineer/system working right and not being flat-out wrong (e.g., speakers out of phase).
If you play with another guitarist and you both use modeling, you can do things like setting you both up kind of wide and panned to each side (whoever's on stage left is panned a bit toward house right), and when one of you takes a solo, you both step on a switch that pans you both center with the rhythm player a good bit wider (however you want...more reverb, detuned and delayed, etc.) and the lead player more focused up the middle (e.g., less reverb, mono delays, etc.). Things like that go a long way toward pushing the solo forward without having to get crazy louder.
And the cool thing is that FOH's mix doesn't have to change....they just leave each of your L and R outs hard panned at the same level and let you control more of your mix in a very repeatable and predictable way.
It does take some setup, and it'll work better if your band runs a digital mixer for your own monitor rig with isolated splits out for FOH (or go whole-hog and just do your own band mix and send FOH a stereo pair if you can get away with it). But, your IEMs will work better with that setup anyway, and you can ensure that at least your monitor mix is consistent.
We're kind of in a golden age where these kinds of things are not only possible but relatively affordable.
