When I first came to Thailand, I was appalled when one of my friends told me the pistol nozzle (like we use in the US for doing dishes) next to every Thai toilet[1] was for spraying yourself after using the bathroom.
This was disgusting to me at first.
Echoing a few other comments, I feel like a bidet is something you have to experience yourself before you trust it. Once you do though, I think you are forever changed.
On my last trip back to the states, I remember feeling perpetually disgusted that all I had to clean myself with was paper. It's disgusting - barbaric even... you're just smearing waste all over yourself.
If you don't feel like spending the money to install a Japanese bidet, a Thai "bum gun" might be a more wallet-friendly option.
[1] - http://thatluckyboy.com/wp-content/uploads/2013/05/bum_gun_t...