EE is much more intense - no question. I love both, and I love EE more. It's my top disney ride. It IS much smoother than BTM, but it is much higher, much faster, etc. I liked the poster that said it's nothing like the big boys at six flags though - those are just built to hurt you. EE is a big coaster, but the theming makes it feel smaller. Except for the initial big climb, you don't see all out around you (due to the theming), so it may not feel as big as it is.
Put it this way - We took my 4yo daughter in 07, and again when she was 6 in 09. She went on both - both times (she is tall for her age). She loved BTM both times (hands in the air and all), when she rode EE with me she had her head down clutching my arm as hard as she could. It didn't scare her enough to be upset, but she was "one and done" both times on it.
Now when we go again in June (at 8 years old), I'm not sure what to expect. "Yet-I" wouldn't be surprised if she was a cling-on again...
To me it isn't scary though - I just laugh and giggle the whole time... Nothing like the bigger, more intense coasters found in the rest of the country...