Yea we've been using Linear for almost a year, it's an excellent product. Basically think Superhuman for JIRA. Very clean, not overcomplicated, great keyboard support.
JIRA has a quite good keyboard support once you find the "." (dot) menu: press the . key, for example after selecting tasks or when looking at one, it opens a menu with autocompletion. This feature alone makes JIRA way more bearable for me, you can become really quick once you learn the correct keyword to complete for!
