There is little doubt the skill of today's pitchers, and the hitters who have adjusted to these better pitches, is higher than it was in the 60's. But today pitchers train for 100 pitches, they are not expecting to ever go 10 innings unless it's the World Series. But that does not mean they are pussies. As for the IR perhaps teams take injuries more seriously today rather than "throw some dirt on it"? That's certainly the case with head injuries.
With that said I've noticed for years how much more fragile baseball players are then other athletes. Seems like with every collision there is a guy hurt, some come out of the game. Football players play in so much more pain, they must laugh at baseball players.