So there are 2 things that I really dislike about the pitch clock.
Number 1, and easily the biggest problem that I have with it, is that I do not like that I'm going to most likely spend more total time in my drive to the stadium and home from the stadium, then I'm going to spend at the actual stadium. Living on the Eastern Shore, driving a little over an hour each way, I actually want to spend 3 hours in the stadium. Now on the flip side, I don't want to spend 4 and not get home until 1 AM, but I want to spend more then 2 hours there also.
Number 2, I don't want the game to feel "rushed". And part of that is just getting used to it which will eventually happen, but even after getting used to it, I still feel like 15 seconds just is quite an extremely fast number for a pitcher to catch the ball, get on the rubber, choose which pitch he wants to throw (especially at the end of a game in a crucial situation), and throw the ball.
I'm not opposed to speeding the game up and preventing the 4 hour baseball games. I just think they could have done a 30 second pitch clock which most likely would have prevented the 4 hour games, while also preventing the two biggest concerns that I have with it above.