there are the people who know just enough about touring WDW to understand that if they want to ride the most popular rides with minimal wait they have to get up ealry and go to rope drop (where ironically they wait in line to get into the park and then take part in the running of the bulls).
This is one of the common refrains from people who don't like to get to the parks early because you have to wait to get into the park.
But, if you are willing to wait 15-30 minutes for the gates to open, you will save a lot more than that as the day goes on.
Using DHS as the classic example. If you can be near the entry gates when they open up (now usually 15-30 minutes before official opening, you can head right to TSMM and get on and off the ride before 9 AM (and possibly get a FP for a reasonable return). Then you can go to TOT and RNRC and ride both of those before the lines get too long, and usually be done with both of them well before 10 AM. People who arrive at 9AM because they don't want to wait at the gates will be lucky to do one of those attractions by 10 AM.
With the major attractions accomplished, the early bird can move on to the second level attractions while the masses are still waiting for the big 3.
Also, the "running of the bulls" is really overblown. At DHS it has been pretty much eliminated by removing the ropes at the end of Hollywood Boulevard. At MK, once you get through the railroad arches, the crowd thins and spreads pretty quickly.
Sure, there are still some idiots who insist on running, but the handful of people who pass you aren't going to have a significant effect on your wait time for the first attraction and none at all on the rest of the day. We just watch them and laugh.