I too am a “revert”, finally at rest after a bout of atheism, followed by some years as a Protestant, followed by many years as nothing in particular (agnostic, I suppose) before coming home to Mother Church. But I don’t feel any resentment: I got much good out of going to those Protestant churches at that time, and indeed I think I can understand the Protestant viewpoint better having been one—this is very useful in apologetics. The people I met there were quite nice, but I left as the relativism became too much of a problem for me to accept (too many differing and sometimes contradictory “truths” about essential matters of faith). However, I didn’t go out with a bang, so to speak—no discussions or arguments, I just stopped attending. Did you have discussions about your “re-version” with members of your former churches? That might make a difference…
Having said all that, while I do not harbor any ill-feelings towards the churches I used to go to, or the people I attended with, I have to say that I regard Protestantism, taken as a whole, with much more negativity than I ever did before. I suppose some of this has been caused by reading more history, and in particular the history of the “Reformation” (I just finished historian Eamon Duffy’s “The Voices of Morebath”, and it didn’t help my attitude, I can assure you). Also, I am increasingly disturbed by the effects of relativism in our culture, and I rest some of that at the feet of Protestantism as well. I guess it could be said that while I love individual Protestants, I have an intense dislike for Protestantism.