I've been off caffeine for about 3 months now. I second the discovery of not crashing at 2-3pm. I'm just... fine, all day long. I never feel sleepy or groggy anymore. When I get up in the morning, I'm just awake, I don't need time to "wake up". If I miss sleep for whatever reason, I can still function the next day, which never used to be the case. I sleep through the night, I never get up to pee anymore. I noticed my urge to pee, the discomfort when you really have to go pee, doesn't occur. Even if I hold it for hours, it's never really that bad. I never have gut issues anymore. I had struggled with IBS most of my life, and it seems, well, gone. Between eating carnivore and not taking in any caffeine, my gut is never upset anymore. I also don't get butterflies like I used to, just for no reason, to feel nervous. When I am nervous about something it doesn't feel as intense and it doesn't affect my guts. This has allowed me to face difficult situations without my body betraying me.
I initially quit caffeine to stop the diuretic effect, but the other effects are enough to make me not want to go back. I don't even feel tempted. I've also stayed away from carbonated drinks, even fizzy water. Now I'm a boring healthy person who just drinks water and milk, and my treat is a cup of decaf, but only on the weekend. Not even sure if I'll keep that up, I might switch to some non-caffeinated tea for a hot drink.