This is a fun topic! About five or six years ago, a friend and I started counting and realized we were both close to visiting all of them, so we had a good-natured race going on. I keep track of every show I see in a spreadsheet - yes, I'm a nerd, but it's so helpful when topics like this come up!
My first show was PHANTOM OF THE OPERA in 2004 - still my only time in the Majestic.
I won the race when I saw THE LITTLE MERMAID at the Lunt-Fontanne in 2009 (there were 39 open theaters at the time)
When the Sondheim opened and I saw BYE BYE BIRDIE, I officially saw a show in all 40 Broadway theaters.
I'm not sure which theater I have been in the most times. Probably the Nederlander from all the times I saw RENT, but there are other theaters where I have seen almost every show that played there since I started attending theater.
My favorite theater is the Lyceum. Not only has it held some of my favorite shows, but you can smell the history when you walk in (not in a gross way). I love it. And the sightlines are good; even in the back of the balcony, you don't feel miles away.
Nothing matters but knowing nothing matters. ~ Wicked
Everything in life is only for now. ~ Avenue Q
There is no future, there is no past. I live this moment as my last. ~ Rent
"He's a tramp, but I love him."