I do. Although, now that it is run by a madman, I have considered I may need to find another avenue in its stead. Often, it has been my main source for finding interviews with authors, film directors, and so on (although Facebook would have likely done as well), and for contacting writers for my publishing company.
I not only have a personal Twitter handle but also multiple Twitter profiles for my websites and business. I still regularly tweet. I am active on Twitter because I get traffic to my sites through Twitter.
I have two Twitter accounts at the moment, one is my content creation and video game streaming account and the other is an account for my site. I don't use Twitter as much as I used to though since all the changes with Twitter Blue I have noticed my tweets don't get seen half as much as they used to which is a shame.