Found a very helpful website -- www.quaeldich.de -- which rates climbs separately for prettiness and for difficulty. It's showing me a whole lot of new roads to ride.

Most bicycle climbing websites don't rate prettiness at all, or they just have a single quality rating which is an unknown mix of prettiness or difficulty or whatever factors.

This website also includes lots of less-well-known climbs -- so it could be a good source of ideas even if you don't agree with the numerical 1-5 ratings.

Example:
from the home page, I click on P ässelexikon, then Regionen, then Schweiz, then Regionen, then Berner Oberland, then P ässe, which brings me to
this page of Berner climbs
then I go to the top of the column of green stars and click on " Schön"
which groups the
prettiest climbs at the top.
What's interesting to me is that two-thirds of the 5-star climbs I've never heard of before, and I've only ridden one of them so far.
Then I click on Griesalp, then Karte, and I get this
map of several more nearby climbs
which I didn't know about.
(then click on "Map", zoom in a couple levels, and I see the road to Griesalp)

I've also done this for larger areas, like here's
Valais / Wallis prettiest climbs
with some (possibly unexpected) findings about what some riders (visiting Germans?) think about Les Agites and Col du Sanetsch.

I'm finding that my own ratings of the climbs which I've done are within one star of the quaeldich.de ratings. (Of course there are some pretty roads that haven't been included yet, e.g. Lac d'Emosson near Finhaut)

So now I've got a whole new list of places to ride. Interesting how putting a subjective number on prettiness enables me to get my planning away from relying on the obvious numbers of size + steepness of climbs.

Ken