In general I like the Fast Pass system.
I don't plan my days months in advance.
I don't run back and forward across the parks from one fastpass ride to another.
I fastpass the ride I want to go on then wander off round the park. Shopping, shows, parades, other attractions (with no, or small, lines) food and photographs then wander back for my fastpass time. (I have never tried to get on a ride if the ticket time has expired.) Do the ride then fastpass the next one.
I think this is what the people who thought the fastpass idea originally up had in mind. It is just like being in line but you get to go and spend your time and cash somewhere else.
Could I use the system more effectively?-yes. No doubt.
But I'm not in a rush. I'm on holiday.
Would we rather stand in line for two hours (even a well themed one) or sit and eat funnel cake watching a parade go by while waiting for our turn on the ride.
No contest.
OK there is no EASY way to stop people being in "two lines at once" with there fastpass. As far as I am concerned this is really the only major downfall of the system and the sole reason for the increase in line time for regular riders.
If you don't like the fastpass system; get a ticket and then throw it away unused. If what people have been writing is true (and I have no reason to doubt it), in theory, this should speed up all of the regular lines for every other attraction in the park. (If only by fractions of a nanosecond.) At least you will have registered and actioned your protest.
I'm on vacation. No stress allowed.