This is all really good information, even the negative. The problems posted by dmccoy1693 are things that would certainly have driven me up the wall. I feel like dmc just said "I don't like pizza because of these reasons..." and a bunch of people started yelling, "How can you not like pizza? All your reasons for not liking pizza are stupid!"
Everybody likes different things. I have players who love playing on pen and paper but most of my player prefer playing on our touch screen tabletop pc with Maptools or Roll20. All my players prefer to create their characters with the online Character Builder and I extensively use the Compendium and Encounter Builder for research while building an adventure.
I only buy PDF versions of the books and adventures for a number of reasons. One is that during the planning phase of an adventure I use tools like Realm Works or Masterplan to organize and present the content. If I had to use the adventures in the format they're presented the pace of the games would slow down dramatically and a higher workload would be placed on me as DM. When I'm DMing, the less that I have to deal with workload wise, the more creative and involved I can be with the adventure. Also, in PDF format, I can copy out the handouts and maps so I can print them. If this were paper I could only do that once and then I'd have to buy another book. I'm not interested in doing that. Last thing is that when I need to find something in a pdf reference or adventure book I can go to the directory where I store them and use the Windows quick search to search the contents of every single book, similar to the compendium but I get the surrounding context as well and from multiple sources usually.
I don't have an infinate amount of time to prepare adventures and taking away the electronic tools would greatly complicate the process. Scaling encounters, searching for cool monsters that are appropriate, easily creating and more importantly updating characters, these are all things that the online tools get us. I'm old enough to remember playing AD&D before the first software version of the tools came out in the 90's and I really don't want to do that again. Spending two hours just to get a new player started is a major turn off.
That's my 2 cents.