I will tell you that many of us started with the same attitude and disbelief when New Opera came out.
All you have to do is remember the fits and starts we went through when learning how to use the Old Opera.
Just start working your way through it, it will come over time - but you will never get back some of the interface you are used to (like a mail client within O29, and bookmarks how it used to be). It just takes time.
But I WILL tell you the New Opera is much smoother and efficient than Old Opera and almost all pages load unlike Old Opera where so many will not load correctly