I rope drop all the parks and hop out. How effective that is depends on which park you go to and what time of year. For it to be effective, you really need to be there at the open.
For example, opening at MK in October, I did all of tomorrowland and fantasyland I cared to and was at the barrier holding crowds back into adventureland right before 9:00 am opening. Totally worth it. In August, I got through some of what I wanted in tomorrowland (which included riding space and buzz multiple times). Did not get into fantasyland before general park open. Still good wait times in adventureland, but I am not walking on BTMRR; I am waiting 15-20 minutes. We ceded fantasyland because my kids have outgrown it, and I won't insist if waits exceed 20 minutes.
at AK in October, I was finished with the park at 9:30. I did not ride the safari because I was with my son, and he did not want to, much to my irritation, but we go a lot, so I let it go. We rode EE, dinosaur, and primo whirl repeatedly. This was when we decided to do all four parks in one day, and we did do it.
Even with early entry Epcot, I can't get soaring and TT in without a long wait. I can walk on one, but not the other, and generally get through mission space and spaceship earth with no waits.
HS is great for early entry, but you do have to be there before park opening because it is a soft one. We were able to do everything we cared to do before lunch, but we aren't show people. This held true regardless of time, but we were not able to ride multiple times on each ride in August as we were in October and June