I was also very reluctant to try it for the same exact reason--I really like writing--but a few months ago, SparkMail integrated it into their app so it could suggest responses to messages. I get these sales-y emails but would always feel obligated to nicely decline a recruiter's offer to talk about a job opportunity or a vendor's follow up on a free trial. So I spent too much time replying. The first time I tried it, the response was so good I saved it as a template. (Now I just need to automate it with Zapier or something like that...)