I don't like FP+ as a whole and prefer FP- but there are certain aspects of FP+ that are an improvement. We liked the ability to choose our own times and have the FP without having to grab them at the parks. We liked the idea that we can switch times around on the fly, but it doesn't really work out in practice for certain rides.
The crappy parts for us are the awful website/app and the limits placed on the system (tiers, one park only, and 3 FP). There are rumours of the hard limit and one park only changing, allowing you to get more FP subject to availability after you used your 3, so that may be improved by the time you go. If those don't sound like they're going to greatly impact your trip, you'll be fine. Only you know how your family likes to do Disney.