I use this one program called Sendy (a PHP app) to help manage my email list. It's a typical LAMP set up.
It's been running on a $5 / month server uninterrupted for 905 days with no down time related to the app malfunctioning. The whole system uses around 300mb of memory.
Yesterday I decided to spin up a new server to finally retire the old one since it was using Debian Jessie that just went EOL 2 weeks ago. This required migrating a ~3 year old version of Sendy to the newest one (dozens of database schema changes included) and export / import my entire database.
Everything just worked and all I had to do was rsync the PHP files to a directory and access the site in a browser, and it was upgraded and ready to go.
I even ran into what I thought was a bug because my existing forms weren't working, so I looked into the single PHP file that was the form's action and within 5 minutes determined I was missing a hidden field (something Sendy added in a recent version). That was the first time I ever looked at its source code and PHP in a long time.
It very much reminded me of my PHP cowboy days. No complicated build process, no dependencies (the whole app uses PHP's standard library), no having to restart the server between deploys, etc.. I know there's downsides to that and I'm very aware of them, but after having worked with increasing complexity for the last 10 years of web dev, man it felt nice for a change.