I was a bit peeved when I found out our Tig used it. It uses about as much as the others have said, so doesn't need filling that often. However, seeing as our Tig was first designed lots of years ago, filling is via a hole in the boot floor which is a proper pain.
New cars with it engineered in have more accessible filling. I've just bought a new Caravelle, and its filler is behind the fuel filler flap.
Both vehicles give an indication of when they needs filling. The Tig gives a warning and countdown from 1500 miles, the 'Velle gives a range in whole 100's of miles in the MFD. It is advised not to let the range drop below 500 miles and that you should put at least 5 litres in when topping up.
Apart from the Tigs filler location, it's no more of a chore than topping up the screenwash.