Then how are those lines longer now? That is what I mean. People are claiming the lines for those rides are longer now. The only way that is possible is if before they were wandering the parks.
Here's my attempt at explaining what I think Astridia is saying...
Rides that were previously not on the FP system are now experiencing back-ups in the line, resulting in longer standby waits, because those lines are halted to allow FP+ users priority access to the ride.
Think of it like traffic. You can have a lot of cars on the road and the speed may slow somewhat, but as long as things keep moving, it's not too bad. The traffic flows and there's not that long of a wait. But as soon as someone has a fender bender that causes traffic to STOP, the resulting back-up can quickly becoming a miles-long traffic jam with hours of delay.
So, say, 100 people show up and get in line for a ride. When there was no FP for that ride, those 100 people would flow through the line without delay. So, when the next 100 people got in line, there wasn't a back-up. Things kept flowing smoothly. But now, 80 of those 100 people are standing still in the line when the next 100 show up and get in line as the FP users go ahead of them. Then there's still 160 people in line when the next 100 show up to get in line because only 20 at a time are going through the line for every 80 FP users.
The less the standby line moves while FP users are given priority, the more the line backs up and the longer the wait becomes. The same number of people might be getting in the standby line as before, but they used to move more efficiently through the line. Now they are standing still more and waiting longer as a result.
Also, it's helpful to understand whether people mean duration of the wait time or length of physical distance when they say a line is "long." Even a short line will experience a long wait if it doesn't move.