I like the old version of Test Track better. I also liked the extinct attraction that came before it, World of Motion. Spaceship Earth showcased the history of communications with solemnity; World of Motion showcased the history of transportation with a wicked sense of humor!
I like the Winnie the Pooh ride that replaced Mr. Toad's Wild Ride, but I still like Toad better. I loved Tomorrowland's If You Had Wings, a ride sponsored by the now extinct Eastern Airlines. They replaced that with Dreamflight by Delta, which was okay. I went on it a lot because the lines were always short. Now Buzz Lightyear's Astro Blasters is there. That I expect to be there for a long, long time, given that my cousin's kid wanted to ride it again and again when my parents brought him to Magic Kingdom.
All in all, I miss extinct attractions, but I try to be open minded to the attractions that take their place and usually like them, too. I just wish there was a way to keep both the old and the new.