Yeah, startup times is something that you don't really notice until you have a system that is really fast and responsive, and them you simply get annoyed by when you're using a system with slow startup times again or get accustomed again with the slowness.
Startup times didn't bother me too much, but nowadays it does, specially for things that my brain assumes that should be fast. This is why, for example, both my Neovim and Zsh configuration is tuned to start in <0.1s:
time zsh -c exit
zsh -c exit 0.00s user 0.00s system 84% cpu 0.007 total
time nvim -c qall
nvim -c qall 0.07s user 0.02s system 100% cpu 0.081 total
It does makes a massive difference, for example spawning a new shell is instantaneous and when I know that I will make some small changes I much prefer to open a file in Neovim than Emacs (my main editor/IDE nowadays).
