This past trip I woke up around 6:45am every day and the results were fabulous! We ordered groceries from Garden Grocer and had them delivered the first day, so I was able to eat breakfast in my room, shower, dress, head out, and be at the EMH park right on time (or a different park for rope drop at 9am, depending on the plans). We were staying at GF on the monorail, so if you're not you may want to budget a little more time; you may also want to consider what time you want to leave the parks if you're going to wake up at that time. It was no problem for me to stay out until midnight or 1am (I tried to be at whatever park closed the latest for the second part of the day), but the rest of my family couldn't do it after one day and ended up waking up at around 10am. If you're energetic this shouldn't be a problem for you.
I strongly reccomend being at the parks at opening, especially on EMH days. I sprinted every day and was able to get a Fastpass for and then immediately ride an E-ticket every time (Splash at MK, Soarin' at Epcot, Midway Mania at HS, and Everest at AK). After that there were still short wait times (and even walkons) for a while in the mornings. I don't know if any other rides do this (I imagine they do) and I'm not going to reveal what it is, but it's worth your while to be on the first boat of the day on Splash.
If it's not your style to wake up early then no, you don't really need to be at the parks at opening every day. But it will maximize your pleasure and minimize your wait times and I very, very highly reccomend it.