Completely agree. Fastpass does not increase the amount of attractions a person can visit in a day. It gives the appearance of increasing the amount of attractions a person can visit in a day; which is what it is designed to do.
You don't like standing in a long line? Guess what? It's longer because of Fastpass. Meanwhile, the uninformed guest is forming resentment at the person walking by him while he waits.
Actually, it does increase the amount of attractions I can do in a day! I know this for a FACT, by looking at my past "trip logs" I've made from the era before FP existed.
You say the lines are longer because of FP, but if you NEVER use the standby lines for FP attractions, and ONLY use the FP lines, they won't be!
Under the old system, there is no way in heck you can get a near walk-on for Space Mountain at 1 or 2 PM on a crowded day, but thanks to FP, you can!
In the old system on a crowded day, to try to avoid long queues in the peak middle of the day, one had to try to make a lap of the park early doing all the major stuff before the lines got out of hand, and then make a second lap doing less crowded things.
Now, thanks to the Magic of Fastpass, it is easier to tour the parks by "land" without all that backtracking!
Consider the following scenario where Tomorrowland is the third land a person tours, after doing Fantasyland (all walk-ons at rope drop, no FP needed yet) and Toontown. Let's say while in Toontown, they got a Space Mountain FP via the Toontown/Tomorrowland walkway, at 11 AM. The standby line is 60 minutes. The return time is 1 PM. Then they return to Toontown and finish touring Toontown in that hour, rather than wasting it in one queue. So then you have:
12 PM - Enter Tomorrowland, ride TTA
12:15 - queue for, and ride, Astro Orbiter
1:00 - since you can now get another FP, you get your Buzz FP. Standby 30 min, return time 2 PM. Then you go ride Space Mountain and are off by 1:20! Even in the days before FP, you would NEVER be off the ride this quickly at this time of day, on a crowded day!
1:20 - Carousel Of Progress
1:45 - Stitch
2:10 - Use Buzz FP and walk right onto the ride!
2:20 - Speedway, so now TL is done (I skip MILF)
2:55 - Enter Frontierland, get Splash Moutain FP, watch parade.
Well, you get the idea. By now, you're on the left side of the park, and the only other FPs you'll need are BTMRR and Jungle Cruise, which are NOT likely to run out anytime soon, even on a crowded day. So you keep walking onto things like the Railroad, Riverboat, Country Bears, Tom Sawyer Island, Tiki Birds, Treehouse, etc., while waiting to use your Splash FP, and the BTMRR and Jungle Cruise FPs you'll eventually aquire, getting walk-ons or near walk-ons on those three as well, when the standby queue is still long.
I think the system is nothing less than an ingenious Godsend!