If you routinely fly a 4 seater - well yes. Because usually we only fly them 2 up.
My friend used to lend me his TriPacer - very capable machine - especially when light - close to Super Cub performance at low density altitude and weights.
Put full fuel and 3 fat b**gers in it - the performance change was considerable. So yes, unless you routinely fly your aircraft at max weight then it is easy to be surprised by a somewhat sluggish 'leap into the air'
The Terrier being a monstrously heavy beast had much less of a change in performance - but then its power to weight ration would never impress!