Or witnessing events on the scale of millennia (or more) in general. I’d love to be a lil ghost after I die to see how the earth fares, how the sun swallows everything, how black holes fizzle out, how eternal darkness encases the universe as the last star dies. It’d probably get pretty boring waiting for all that to happen, which would be a huge drawback of being a lil ghost, but I’d still love to see it.