To further illustrate Robo's post, I was at RD/EMH earlier this month. Through turnstiles about 15 minutes early, slow walk behind rope. I walked quickly, but did not try to speed walk nor stay right at the front. I had a FP+ for 9:00. I was able to ride twice standby, then had to wait to use my FP+. So I rode twice within about 45 minutes. At that point, if I remember correctly, standby was 60 minutes. So my experience was not at all like swars.
There are just so many variables, go with a plan, but remain flexible!