Although I like exploring for ruins and the random boosts they give, I've noticed alot of benefits without them.
For one, the early game lasts longer, all players recieve less free techs, population etcetera. This I really like, it seems the early era passes faster with ruins on and it's my favourite era so...
Also, the boosts are too varied in power. A small amount of culture is nothing unless gotten very early, the map boost can be totally useless (yay, a map of an area I just explored...). On the other hand, getting lucky with the unit upgrade, free tech or even population/culture very early on can be pretty big.