The new thing sucks. Or am I having a knee-jerk reaction to something unfamiliar? Maybe I'm the asshole.
The new thing falls short of the old thing. Or does it have different goals from the old thing? Maybe I'm the asshole.
Whoever made the decision to put the new thing in my path are out of touch and don't understand what I do or how the old thing helped. Or have they seen something that I don't see yet? Maybe I'm the asshole.
Sometimes I'm the asshole. Never entertaining the possibility that one is the asshole is what makes one the asshole.
So, the secret is to be alone in a room, so you can swear freely. Walk around when angry and complain to yourself. But always go back and continue using it and eventually, that phase will pass. After that you will build new set of habits that work around disadvantages and use advantages.