Plus the transporter's iconic to Star Trek. I don't think they invented them but they brought it to mainstream.
Its one of the things most associated with Star Trek.
Of course it had its problems, like when they wanted the landing party be in danger they had to make some lame reason why they couldn't beam up.
I think they made a mistake later in making the transporter too powerful, being able to beam anywhere. I always wondered why the 'evil' Romulans just didn't beam bombs or deadly viruses aboard Federation ship