Hi, Kerry!
I'm a very heavy user of my cell phone so I can run the battery down super fast. I understand your concerns.
There are plugs in various locations across the parks but there are very few designated as charging stations. Before portable chargers because a more affordable option, my favorite spot to charge my phone was on
Tom Sawyer Island at Magic Kingdom Park. If you go to Tom Sawyer Scavage Fort, you'll notice benches in a courtyard. There is a plug near one of those benches. It's a great spot to sit down, plug in and let the kids run wild. I kind of miss having an excuse to take some downtime on the island now that I go to the park with a portable charger.
For your happiness, I highly recommend a portable charger that can offer your phone two or three charges so you can enjoy the parks for a long time without worrying at all about your phone.
Let me know if I can help you with anything else! I know you're going to have an amazing vacation.
-Jen