I've used TripIt Pro for years, and it just keeps getting better. Both the paid and free version do a fantastic job of organizing my transportation and hotel info, and I like that I can just forward the confirmation/itinerary emails and the information is in most cases pulled in without much effort on my part. I find it helpful to be getting notifications about my flights. I'm personally not overly concerned with who "owns" the information, since I back it all up. If I wanted real privacy I would have to give up my smartphone, Facebook, Google, and a lot of other conveniences.
I also make up my own "info sheets" containing all the flight, travel and lodging info, phone numbers, schedule, etc. I use Microsoft Word, and save the pages in my Dropbox. In case my phone doesn't have internet, I make it available offline before I leave the US.