When Disney first brought out the FP+ I was right there with you. I didn't know how I felt about that idea of planning my trip way in advance. I've been to Disney World many times since then and I've gotten used to these FPs. You really only need to plan FP in advance for the really popular rides. It also just kind of depends on the season your going. It is something new, and changes in Disney can be kind of chaotic at times. But this seems to be working out relatively well now.
Now you can make 3 FPs per day, for one park. Once you use all of those FPs for that park, you can add 1 more FP. You cannot add another FP until you use up that 1. So, after you use up the 3 FPs, you can continually add 1 more FP as long as you use it before you add another (I hope I haven't lost you lol)
Now, I can't imagine going back to the ticket system lol It's like, "this ticket is going to tell me when I need to come back?!" With FP+, you get to decide when you go (for the most part - there are some really popular rides where you can only get a certain time)
Having a smart phone and the My Disney Experience is golden because you can change your FPs and plans so easily and on the go!