How much is 32GB? That depends. It's more small pictures than large pictures. It's more short vifeos than feature length movies.
We have 4 people (and will be adding a 5th) on a 7.5GB plan and never go over, because we do our large downloading on wifi, so the occasional email, weather app data download, calendar update, etc., doesn't consume much data. I've used about 22MB (not GB) of mobile data from May 15th to now. (I've probably used t least a few GB of wifi data, but that's from my internet service provider, not my phone carrier.)
However, if you're talking about a Verizon unlimited plan, unless you're REALLY pinched for money, I wouldn't give it up. You won't be seeing unlimited data plans again for a long time, if ever. Once you make a change to the plan, unlimited data is gone forever.