I EC'd my first (ds three today! And completely potty-trained since age two). I started ECing him at 2.5 mos. Truthfully, we used diapers quite a bit...just not in the way you'd think!
We put the baby on the diaper, rather than the diaper on the baby.
What most people seem intimidated by is the fact that ECing is a *process* and just like breastfeeding (or parenting in general), it's an ongoing thing...a switch will not flip one day and you'll suddenly both "get it" and never have to worry about figuring things out again. It's a part of understanding your child and his or her needs, whether they be nourishment, affection, or the need to go. And like any process, you don't have to choose once and be locked into how much you're doing it. There were times when we used more diapers, and times when we used none at all.
I made the decision to EC after I tried it as a lark, on a suggestion from a friend. I'd been unable to really come to terms with the fact that I raised royal he!! when my grandmother was left sitting in her own waste at the rest home, yet I was expected to routinely leave my baby the same way.
Once I saw how much easier it was for me to not have to clean smeared poop off a bum (and how much more comfortable it was for my DS), my mind was made up. Now, we didn't have a perfect 100% catch scorecard, but overall, I had fewer diapers to wash, and a happier, rash-free little boy for whom potty training was a process, like any other social situation, rather than an event.
And when Next One comes (due late may '05), I'll use the same technique, because as another poster has said, it makes me feel like I'm in tune with more of my child's needs.
ECing isn't for everyone, but don't rule it out without looking into it.