Ernie was unique in a lot of ways that may be pretty much lost. 1st and most importantly I think, since he mostly worked alone he was always talking directly to you, the audience. It changes the dynamic when a 'conversation' is directed to you, vs overhearing a conversation between two other people. A lot of complaints in this thread are exactly about the guys in booth being too distracted with each other and not nurturing their connection to the the audience. Ernie worked harder than any other broadcaster I ever heard at being interesting to the audience all the time. His work ethic to find all the things he talked about, stories he related, broadcast to broadcast puts today's guys to shame. He was probably better because he worked harder at it.
The other thing he understood better than Dickerson is that over 162 game too much emotion is fatiguing to listen to. If I have one critique of Dickerson it's that he could stand to dial it down a notch - e.g. Jon Miller. (that and stop talking so much about pitch counts in the 1st inning!).