I would liken the Hagrid's EE, morning experience to rope dropping Flight of Passage at AK. I'd guess (just a guess) about 90% of the people in early entry, or lined up at opening in IoA are going to Hagrids, similar to FoP, everyone heads to Pandora. and if you're not towards the front of FoP, you'll end up in line in Africa near the FotLK show. but the line is moving in the morning, no ILLs, etc.
However, hagrids is a bit less reliable to be running at opening, think Rise/Resistance or Test Track at opening....We've done Hagrids a few times, it's a totally fun ride, a must-do, but it's not something we seek out often. So, if we do EE, express or not, we head to Velocicoaster. Then it's Hulk, Dr Doom, Spiderman, and anything we want to see if Marvel, then we head to Jurassic, then Hogsmeade...but we've been going a lot. Or, if you skip Hagrids, could do VC quickly, then head to Hogsmeade for FJ and browsing Hogsmeade with somewhat lower crowds. they build fast. But good time for spells, Olivander's, etc. Then you'd be fitting in Hagrid's later in the day at some point. I personally like that it doesn't take Express, so at least the line is the line, and it's moving if the ride is running. VC has become horrible in the standby line since they started express.
Pteranadon flyers has been closed for a while, no info on reopening, so check for that if you're planning on riding it. One trip, we were in the Jurassic area when it first opened, and we got like 5 rides on Pteranodon before it got busy, need a kid with you though.
Happy planning!!!