I’ve got some pretty good Nyquist reverb effects that I use myself.
They are slower than GVerb or VST reverbs, but they could be made easy to use (presets), and they are true stereo reverbs.
A primitive example is here: https://forum.audacityteam.org/t/stereo-reverb/20310/1
If anyone is interested in helping to develop a good simple Nyquist reverb for Audacity, please say. The main “help” that is required is in testing different types of reverb on different types of material, tweaking settings and keeping a record of what sounds good on what material for what type of effect.