I'm not sure about the morning EE, but the evening hours at Epcot really weren't worth our time. Not much was open. This was almost a year ago and before Soaring, so maybe more rides and stores will stay open. I hope so.
Morning EE at MK actually makes the evenings better, I think. Most people go in the morning and then leave by afternoon. Evening EE at Epcot ... not much was open. When we went in May, it wasn't crowded in the evening here during Magic Hours. The shops stayed open, so shopping was good. We mostly just walked around, enjoying the crowdless streets!