While I'm not a Freemason I know plenty of folk who are, including a great-uncle who is a Past Master. Locally they attend one meeting a month, unless they have some office that requires extra meetings (like instructing new candidates, etc.).
I researched them, with a view to joining, some years ago before deciding that I didn't want to. The first time I did the research it was as a JW, so I had difficulties with the idea of an immortal soul and questions over the quasi-"religious" nature of meetings. The second time I was more open to the idea but still decided it wasn't my path.
I raise my eyebrows at some of the sites you'll find online. Often they are full of bunk. The ones that especially amuse me are the ones stating that the WTS is a Masonic organisation, which is so far from the truth that its out in Andromeda somewhere.
In many areas it has reduced down to being an old-boys club, which is a shame as I understand that some of the ritual is very beautiful. They are also involved in a lot of charity work behind the scenes, though rarely make a fanfare about it. The Shriners are probably the best well known for their efforts with children's hospitals.