I fully appreciate why some people would like level meters, What's wrong with that feature, it may be really useful for many. I hope it gets implemented and many get a lot of use out of it.
My experience with other units with meters is that in theory they seam like a great idea but in practice they still don't yield the desired results. Clean tones register differently to overdriven tones and modulations, delays and reverbs again register differently for the same apparent volume, in my experience anyway. To me results can be just as unpredictable.
For me the only way to really level match is to go through each element in my path and level match the bypassed signal with the affected tone by ear. This way I can bypass any effect and still have a useable tone. Just like the old days. I think the helix actually makes this really easy. I resigned myself many many years ago to not listen with my eyes. It doesn't take too long and I take regular breaks to rest my ears.
Unfortunately I do have to do this at gig volume and studio volume. Fletcher Munson and all that.
The op mentioned he used to use half a dozen pedals or so, I guess he never used to have 30, 60 or more tones in them days.
Wow 120 presents I can imagine that, must be some hell of a covers band. When I was with a covers band i can only think of 10 or so presets. 120, I sympathize.
To me the helix is the easiest unit to program I've owned and would never dream of not creating presets from scratch. My golden rule, keep it simple.
Anyhow good luck with your request and happy new year all.