In the US every Republican takes the Grover Norquist pledge to always make taxes as salient and as unpleasant as possible. The idea being that it will make voters more anti tax

I wish this were true but they get paid by taxes. Besides, there are few things more unpleasant than having your hard earned money taken away from you, regardless of how it happens. I don't think it takes fancy paperwork to make people oppose it.

Once you get habituated to it, it really is easy. When I was younger I was appalled by how much I was losing to taxes. Now I don't even glance at the line items. All that matters is that the end numbers. Hell, if I didn't need to enroll my kid in school which requires a receipt for property taxes, I wouldn't even know that literally 80% of my local taxes to schooling. My property taxes are pretty invisible to me. I don't file, my bank does. It really puts into frame why when a city gets old, they start cutting taxes and squeezing schools.

If taxes were filed automatically, honestly, I'd pay no attention at all to them, but having to sit once a year an actually look at the amount I paid, does get me to think about taxes and what they go towards, at least a little.

I’d wager the money from lobbies and companies like Intuit more than make up for it.

Also, republics are “anti-tax” in word and pro-tax in practice, as is the American way. When it comes to particularly republicans, anti-tax is code for removing social safety nets. They want taxes if it pays them, or pays the right contractors, or funds the military etc but when those tax dollars could go to social welfare they suddenly think it’s time to trim the fat.