Totally depends on the park.
In MK, we usually used 5 or 6. When DD was little, we would FP Peter Pan anywhere from 3 to 5 times a day because it was her favorite. We would FP Pooh when one of the Peter Pan times expired if the line was long, but if the line was short for Pooh, then we would just ride it and stick with FP Peter Pan. At some point in the day DH and I would usually FP Space Mountain and switch off. Now, as DD is a little older we might throw a Splash in there-which would probably take the place of one of the Peter Pans- but we would still FP Peter Pan more than once in a day if we could. (Also, she likes SM- so we would add her to that one). So FP+ messes with our usual MK plan as we can only FP Peter Pan once- and the lines are usually too long the whole day for us to get in and ride it again.
In EPCOT, we usually used 2 or 3. We would FP Soarin and Test Track. Sometimes, depending on our schedule and the available FP times, we would FP Soarin again. Although if we FP Soarin twice it usually meant that we didn't FP Test Track because the line was short enough that we just went through- as usually we head over to WS mid-day and rarely cross back over unless it is use a Soarin FP. So FP+ messes us up at EPCOT because we can't FP Soarin twice and we can't FP Soarin and Test track.
At DHS- we usually use anywhere from 1 to 5. 1 for TSM and 1 for DH and I to switch off at RNRR- although sometimes we just use the single rider line instead of getting FP. Now, DD(7) is close to being brave enough to want to try it which creates a problem with tiers. We only do 1 DHS day- and single rider doesn't work for her because she will need one of us next to her with her jitters. (We would have done 2 FP at TSM if we could have, but by the time the 1st one of the day lets us get another one, usually the only ones left are late at night. I don't ever recall getting 2 FP in a day for that ride). Other than that, if there is a line for Star Tours, we probably FP it at least once and maybe two or three times as the FP usually kick in within 30 minutes on that one. If there is not a line, we just ride it about 3 times in a row - then cut DD off, and maybe we come back later and do it again. So really the only way we use more than 2 at DHS is if Star Tours has a line- if it does we will get 1 for that and if that FP kick in pretty quick then we would go through anywhere from 1 to 3 FP on that ride. So FP+ messes us up at DHS because we can't FP both TSM and RNRR- which means DD will probably never ride RNRR unless we happen to hit a low line someday. We most likely won't wait over 30 minutes for it- and we won't give up the TSM FP
At AK, usually it is 1 to 3. We usually FP Safari once and we might FP it twice in a day- depending on the line etc. We usually ride it twice in a day- but often we don't need FP to do that. I'd say usually unless the lines build up fast- we ride it 2 or maybe even 3 times- but only use FP for that once, if at all. DH and I will either grab FP for EE and switch off or just single rider it. (Our last trip we did FP+ for EE and DD was brave enough to get on it-- I don't think she will ever get on it again though!
Let's just say she wan't a big fan!). So FP+ somewhat messes up our day at AK, because we can't FP Safari twice- although it isn't a given that we would have done that anyway.
So, I think the biggest problem for us with FP+ is that we can't FP the same ride more than once and with tiers we can't hit all the rides we like to FP. (and the running back and forth across the park it made is do which we hated). I definitely wouldn't call us super users of FP-, but we still don't like FP+.
Not exactly a scientific poll - just my curiosity.
