The average daily attendance at MK is about 45,000 people.
This is all going to turn into an anecdotal contest, but my experience was not a 25 minute wait for Mine Train. The wait time was posted at 20, but that was not accurate. We did it twice -- once an hour in and once at the end, and both were walk up to a line that was maybe three stops deep. Five minutes. Maybe seven. Maybe five at PP. Everything else was the walk through the queue and waiting for a vehicle to arrive. But you're using the most extreme example and extrapolating it park wide. Unless I've misread no one at all has experienced average wait times of more than a minute or two for rides other than Mine Train. And even the most skillful touring and FP strategies require a lot of planning, effort and refreshing if you're going to get 15 rides into three hours.
I might be misreading you, but it seems you're using one heavily trafficked ride and extrapolating it park wide. At least what I experienced was no wait for almost every attraction, and a comparatively very small one for the few that had any wait at all. I had a few lines at snack centers, but they were never more than a minute or two. Everyone was in a good mood, no one was complaining.
Is it a great deal if you've got 7-day MYW tickets? Maybe not. But for one day, I think it's the best deal they offer, and still would be at double the people. We might lament that it's not as good as it used to be, but I'd still rather spend a night doing it for 141 bucks than a day battling crowds and lines for 120.
This is all going to turn into an anecdotal contest, but my experience was not a 25 minute wait for Mine Train. The wait time was posted at 20, but that was not accurate. We did it twice -- once an hour in and once at the end, and both were walk up to a line that was maybe three stops deep. Five minutes. Maybe seven. Maybe five at PP. Everything else was the walk through the queue and waiting for a vehicle to arrive. But you're using the most extreme example and extrapolating it park wide. Unless I've misread no one at all has experienced average wait times of more than a minute or two for rides other than Mine Train. And even the most skillful touring and FP strategies require a lot of planning, effort and refreshing if you're going to get 15 rides into three hours.
I might be misreading you, but it seems you're using one heavily trafficked ride and extrapolating it park wide. At least what I experienced was no wait for almost every attraction, and a comparatively very small one for the few that had any wait at all. I had a few lines at snack centers, but they were never more than a minute or two. Everyone was in a good mood, no one was complaining.
Is it a great deal if you've got 7-day MYW tickets? Maybe not. But for one day, I think it's the best deal they offer, and still would be at double the people. We might lament that it's not as good as it used to be, but I'd still rather spend a night doing it for 141 bucks than a day battling crowds and lines for 120.
It made me feel bad for all the people who stood in long, hot lines, in the middle of the day to ride the same rides! We started off with dinner at Kona Cafe at 7:00 and then headed to the park for our SM FastPass, buzz FastPass, HEA, and SDMT FastPass before the party. At 10:00 we grabbed our first bottle water of the night, and watched philharmagic while the park cleared. Next, we got lucky and walked onto PP! 
By the time we got off, it looked like it was about a 5 minute wait. Next, we walked on HM, Aladdin, PoC. We then got our ice cream and more h2o as we headed to Splash and BTMR. We rode Splash twice, without getting off, which was so fun! Then walked on to BTMR. It was now midnight so we headed back to fantasy land and walked on to Pooh, teacups and then headed to SM after we grabbed more h2o and popcorn. We rode SM after a 7 minute wait and then decided we had enough fun at 12:40. We took our time leaving, taking a few photos in front of the castle, and headed to the Polynesian bus which was right there and we were in our room 15 minutes later.
This event has ruined MK for me, because now I only want to experience MK this way! 
To walk on every ride (or only wait 5 minutes) is a Disney dream gift! I highly recommend it, you will have so much fun, I promise!
Then I hit the cart near space after riding the first time, then watched the line at it while DD rode space a 2nd time, and when she came out she got in the line. Consistently 13-16 groups deep. 
