Secrets in games

The memories of playing doom and coming across this secret door with a weapon that normally you could not get till later on was such a thrill and really missing in games now. Was playing the remake of shadow warrior and came across a secret and i thought oh i forgot about secret areas as i see them so rarely.

Now secrets are either unlockables or hidden items you can find that have no real use and do not feel really substantial i mean even in the original doom there were entire secret hidden levels to play

Now do not get me wrong there are games out there that have some decent secrets i was playing bayonetta and came across some decent ones but while playing bayonetta and just exploring that modern games in many cases are so linear and narrow that i never even thought about exploring for hidden stuff. And RAGE had some really cool stuff 

All i can ask please bring back more secrets and easter eggs in games