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Never been to one.

About 3-4 times a year, usually in the colder months. We treat it as a holiday, which means you're looking at 150-200€ per day including travel, food, entry, etc.

Spas, rarely. Once or twice a year.

Sauna I use every time I go to the gym or swimming pool (time permitting)

Never really. I still feel strange at the thought of going to a pool like place

My wife is an instructor at the local YMCA, and she has gotten me to go to the Y several times a week for a couple years now. I used to use the steam room at least three times a week. But I started working out more, and that cut into my sauna time. So I can say I have almost entirely given that up. Although I did use it yesterday to soothe an aching shoulder, and might do the same again today. Eventually I think I will just buy and install a steam generator in my shower so I can steam whenever I want.

As far as a spa, no. Just not interested in the full spa thing. Although I did see one in Chicago when looking for things to do on a romantic getaway. It was set up like a theme park, where you paid an entrance fee and then did whatever you wanted while in there (they had dozens of rooms, like certain kinds of rock, salt, steam, and ice) complete with a food court that had a couple of positively reviewed restaurants. Just weird to me.

A few times in winter. Love to sit outside when it is cold in warm bubbly water. And then some wet sauna and then a cold shower and repeat.

I have my own sauna but I rarely go there. Maybe once every month or two.

I'm not a fan of them, so highly irregularly.