I currently run systemd (on Gentoo, one of the few distros where you can actually choose an alternative). Been using Linux since before systemd existed, so I've used various kinds of SysV-style init systems before. I generally like systemd. Though it might be over-engineered for some use cases, desktop / laptop OSes are among the most complex, having to deal with events like lids closing, batteries draining, suspend / hibernate, etc. Parallelization and socket activation are very nice features.

I would like to try GNU Shepherd (and the whole GUIX System Distribution in general) but I could never get it to boot on my machine (volume inside encrypted LVM)