I would like to get a certificate with 3-years lifetime. I know that 90-days will limit the damage from key compromise, but I don't want to automate...
I was in the same boat, I didn't like having to run python on my server just to renew a SSL certificate. Still, a few months ago I decided to give it a try and I don't regret it. The certbot script is packaged in FreeBSD, it wasn't painful at all to setup and a crontask later it was over. Definitely beats the crappy free "startssl" certificates that I used previously.
I must have at least 4 accounts there due to them using client certificate login. Great proof of concept why certificate based website logins never took off.