Land usage is also a huge concern with hydro power. Pumped hydro storage means permanently flooding an area to create the reservoir, which carries many above and beyond just the destruction of whatever was there before. The flooded land has vegetation on it, which is now decaying under water. This can release all sorts of unpleasantness, most notably mercury.
Painless? Even accepting that emotional pain doesn’t count (which I don’t agree with) 50% of every person involved in operating a piece of dangerous machinery just suddenly disappearing absolutely caused widespread injury and death among those left behind.