While some are annoyed with the integration of the web on their computers, some of us really make use of the positives.
For example, I moved my email to gmail. All of my email is in the cloud. I can access from home, from work, from my phone, from my tablet, anywhere with a web browser. And I have nothing that I have to backup myself, and it requires 0 effort when I move from one computer to another computer.
I log into my google account with Chrome to synchronize my bookmarks, bookmark bar, history and add-ons. This way, if I am on one of my 3 work computers, my surface pro, my home computers, etc...I have everything in my browser. It works on my Linux machines, it works on my Windows machines, it would even work on an Apple if I had one of those. Again, nothing to back up and moving from one computer to the next is a no brainer.
Dropbox, I use it for simple things. Notes, text files, nothing terribly personal. Makes it super easy for both my wife and I to get to, and also puts my data in 3 places. It's on my machine, it's on my wife's machine and it's stored in the cloud. Therefore, it's almost impossible to imagine somehow losing it. For those things which are more sensitive, I simply use KeePass and store it within Dropbox. Thus, it stays secure and it's replicated. Thus, if for some reason I am dead, my wife can get into everything and get my usernames/passwords/etc.
For me, the benefits outweight the costs. I take measures to keep things as secure as possible. I don't disparage anybody who is leary of using these cloud based things for security reasons, privacy, etc. But it doesn't bother me in the least and I find the benefits outstanding.