I would suggest finding an LBS that will allow you to test ride SRAM double tap. Some like it and some do not. I had Ultegra on my Madone and D/A on my Cervelo. I have Ultegra on the tandem. I do not get on the tandem and say, boy does that Ultegra suck compared to the D/A on the Cervelo. Ultegra is very nice. D/A is lighter and MAY be a little crisper.

I test rode Campy Chorus and it is definitely crisper / more deliberate than Shimano but NOT as light an action and a lot is what you are used to. I am used to Shimano and I am very good at very fast shifts and I do not miss. It is what I am used to.

Ultimately, it sounds like you want something new. I get that way all the time. Go for it but try before you buy!