I bought a mac with 32gb in 2013, figuring this would be good for a long while... these days with mem usage constantly hanging around 28-30gb, I'm now choosing

I bought a mac with 32gb in 2013, figuring this would be good for a long while... these days with mem usage constantly hanging around 28-30gb, I'm now choosing between 64 and 128 for the next machine (with 128+ only being available in apple's 'pro' line...).