If you take your car from the UK to mainland Europe (or vica versa) then you're required by law to fit headlamp beam adapters[0]. These essentially point both your headlights down to avoid blinding people who are now on the "wrong" side of the road. It does make it lightly harder to see forwards, but avoids blinding other drivers.

[0]http://www.motoring-into-europe.co.uk/product-eurolites.html

Yep, that's why it's a legal requirement that if you take a UK car to mainland Europe, you need to put some stickers over the edge of your headlights so you don't blind oncoming drivers: https://www.euromotoring.uk/beam-deflectors-GB-sticker

Wouldn't that mean that headlights seem to be more blinding in the UK, which they don't?

cars sold in the UK have headlight and steering wheel on the other side..