I don’t know of any graphical tools that let you do this, but generally, if you want to search for specific terms/times/commands or anything of that sort, piping journalctl into grep (and optionally grep into less) is pretty effective at finding stuff.

~/src/

Simple, effective, doesn’t make my home folder any more of a mess than I already left it as.

You’d be entirely correct, and that’s exactly why there’s an ongoing debate in physics and cosmology as to why there’s so much matter, and so little antimatter in the universe.