Until this whole FP+ fiasco, I've been a once or more per year guest. Once your kids get past elementary taking them out whenever can be more problematic than it's worth. As a result, we stick to the Thanksgiving or Pre-Christmas time. I should clarify (since this came up in another thread) I am well versed in pre-FP, FP and FP+ eras so I'm aware of change and adjustment. FP+ stinks and has ended my run of WDW trips until this travesty is corrected.
Generally speaking, I won't wait more than 30 minutes for any ride.
Big Thunder: 20
Haunted Mansion: 15
Test Track: 30
Living Seas with Nemo: 10
Kilimanjaro Safari: 30
Tough to be a Bug: 10
Toy Story Mania: 30
Great Movie Ride: 10
I will admit this is difficult to answer. I can't imagine waiting this long for many of these given how easy it was to get legacy FP "in the old days".