While I appreciate the idea and the work that's gone into this site, sadly it seems too basic to be of much use. It only supports half a dozen flags - all of which are easy to use normally anyway. It's missing user agent, headers, cookies, etc. The latter two being items that could be particularly tricky for the "curl novice".
Instead I'd probably recommend people use Chrome/Chromium's developer tools which can export HTTP requests as curl commands: https://coderwall.com/p/-fdgoq/chrome-developer-tools-adds-c...