Just like with temperature, we only feel the relative difference. If the difference is sudden and strong heat, it feels extrem. Like a rockstar getting famous and playing on stage. After these changes subside we feel the stark difference between. the hangover, the withdrawal symptoms. everything feels cold after you spent some time in warm water. Happiness is like that. You can push yourself to a new high, but afterwards you feel the difference between the high and the normal. like many said already its about having a good baseline. If you push that baseline with drugs, everything normal will feel worse.
People only really change when it hurts so much they are forced to. It needs to get much worse to reach that breakpoint and critical mass. (Some reach it sooner than others ) But when it does, we need to be ready with the most logical and attractive solution to avoid them choosing fascism or other extremes. Left ideology needs better marketing, why not sell that utopian vision we hope to achieve.