We used the MK area last August and found the view limited by the trees. However, since then, I believe that they have been cut down or removed to give amuch better view. That said, it was quite good having seating available plus not having to spend 30 minutes or so trying to keep hold of a decent viewing spot on the pavement, only to find someone pushing in front of you at the last minute!!
Not used the EPCOT area, but we tend to watch from around the bridge between UK and France, or down at the lagoon edge in front of France/Morocco.
Just to note that when we tried to book our spot at MK when we were in Orlando, we were told we had to book this with Disney UK, although we were givn a freephone US number to contact them by. You may need to book a few days in advance to secure a place.