In my quarter of a century, as others have said, the biggest change has been the Internet/Intranet - we are now slaves to e-mails and MS Office. Coupled on top of JPA, MOSS and other unwieldy software programs it's a wonder we ever get anything done at all! All the Admin staff have been pared back, as have the number of juniors and this burden means that just to go flying for a couple of hours a week is an absolute pleasure - still it won't be long before they route our Inboxes into the aircraft!
As for Inboxes, there is now a culture of sending you an e-mail, expecting you to have read it and then giving a ridiculous un-agreed timeline to produce a reply or work to the e-mail sender. My telephone hardly rings anymore!
This is the biggest change I think you would notice...
LJ