Is PGP encryption for email easy to use?

I've been thinking about using ProtonMail or Tutanova but I came across PGP encryption for email and that sounds like it might be the best thing to use as it works within Gmail or whatever and all you really need (it seems) is to get Mailvelope in Firefox and do a few things and you're good to go. It is as easy as it seems?

https://www.inverse.com/article/2701...-email-pgp-key