I have to say I do miss the secret identities of superheroes back in the days. I think it added a layer of drama and development for characters.
Having said that, I think it could have been nice if, within the superhero community, members would have trusted each other enough to divulgate their secret IDs to one another. For instance, Tony Stark's "bodyguard"'s bit. I understand his need to protect himself, but couldn't he have trusted the other Avengers? It seemed like an awful lot of trouble to go through, and showed a bit of distrust IMO. But then again, everyone was doing it so I don't hold it against Tony personally.
Another thing I didn't like with secret IDs is the fact that once ONE person finds out, it's like the entire planet suddenly knows, even if there's only a couple of people who should know. An example: when Hank Pym revealed he was Giant-Man in Avengers #28, he did so only to Hawkeye, Cap, SW and QS. So how come suddenly everybody and their dog knows who he is? Same thing happened to Hawkeye later on.
Also, writers play with secret IDs way too much. I don't even know if Daredevil has a secret ID or not these days, nor do I know if the super-friends he had still know he's Matt Murdock or not.
So yeah, I miss secret IDs, but I don't like how the writers have been messing with them through the years.