Even when sitting down we have to aim the nozzle manually, so it's just sitting down for a moment then getting up, which normally is more work than standing there for a moment.

And (at least for me), it is more comfortable peeing standing up (albeit that might be because of a lifetime of doing it like that).

Another compromise is to pee in the shower. or better yet, on there indoor plants, this way we don't need to water them.

I don't like it when my thing touchs the inside of the toilet its disgusting and other xommentters took the time to explain the simple reasons for you

Just the need of undoing your pants/belt already makes it easier to stand up.

And some seats have that front opening, which helps, otherwise there's often not much room to pee sitting down.

Then there's also some people who prefer to cover the seat with toilet paper before sitting down.

It's easier to stand up.