I learned f4 from Tim Taylor's book but gave it up because
(i) I got bored by playing the same positions all the time
(ii) I found that even unprepared opposition could get comfortable positions as Black.
I play d4 now and like it much more, the diversity is just so much bigger here and usually I can get an opening advantage against most opponents I meet. I follow John Cox's repertoire mostly, but maybe I will play the Samisch instead against the KID. You would like it if you like f4 and KS pawnstorms - you will often be able play g4 h4 g5 etc.
The QGD exchange or Carlsbad is a very comfortable variation for White. So far as I have seen, you get to decide when you break and how you break and Black will have to work very hard to generate any counterplay.
Agreed, some of the initial setups are similar, but the middlegames often are very different. I find so many different themes, even trying to steer a game into a position I am searching for.
Admittedly, 1. f4 is not for everyone. I played it for a long time and loved and hated it at the same time. But I have learned to respect it more and more each day.
better is to play e4 right away!