A couple of things. First they didn't even start to build Splash Mountain until 1991, so you never rode it before that and if you did in 2000 well there could have been a number of reasons. I honestly, do not remember when FP started, but, when it did it created longer standby lines. There were almost never any hour long lines before FP. The line, though long kept moving and it was first come first served. When you got near the front you were going to be on soon, now it can take all kinds of time to get moving again. No one ever really seriously complained about the time in line. We all had the same experience. We didn't have to get in line if it was to long, we could always come back later when it wasn't as busy. No one was angry, no one was frustrated. We joked about it, but, it wasn't with anger. FP was a solution to a problem that didn't exist and created more of a problem then it solved. Other reasons for your example of a 2 hour line might have been a breakdown or a stoppage because someone decided to stand up in the ride and it had to be stopped and restarted.