A few things.

1. On mine there’s a little guard around the sprayer and it peeks down under it when in use. There’s also a cleaning mode.
2. I do use a some toilet paper to dry. Less than I would if I wiped. One day I’ll upgrade to one of the fancy units with a dryer.
3. I don’t know about other people but I move around a bit to make sure that the spray gets everything, including “in there a bit”. If you dab to dry and your tp has anything other than water on it you didn’t do a good enough job spraying.

It depends on your bowel movements and how much fiber you eat. I still have to wipe a little after the water, but far less than without. Others, drying is enough.

After using one for a while now, it seems so uncivilized not using one now.

Okay but are you just using toilet paper to dry afterwards?

Some have built in dyers. Even with it, sometimes it feels a small dab helps some more, but it’s not really necessary. Also, that water should be clean at that point… Do you perfectly dry your ass with a towel after showering? Etc

And does just water actually get it all?

Usually. You can also run them more than once. Some have “pressure” settings. Some move back and forth. And you can always check with paper, and see if you need to change something or run another cycle.

You’ve still got to get in there a bit right?

I’ve never had to. Occasionally run a second cycle, but no.

You do dry with toilet paper. Personally if the toilet paper doesn’t come up clean I go back with the water again until it does.

Of course you use tp afterwards, your ass is now soaking wet. Wipe, rinse, then wipe again.