Yes I certainly do and yes that certainly could have been a very serious issue. However I also remember that this potentially serious situation was blown way out of proportion by the media. The reality is that according to dropbox, less than 100 user accounts were effected and zero files were downloaded from those and zero account settings modified.
So they dodged a bullet and the industry as a whole learned from that.
Is there a risk: certainly. But put that risk into proportion. We've had these services for years will millions of users and there was one potentially serious issue that ended up effecting less that 100 users. Compare that to the number of computers, laptops, iPads, or cell phones that go missing every day.
The fact is that the risk of your data going missing because of a B&E at your house is far far higher. Remember an estimated 2000 computers go missing at US airports each and every day! And trust me, if you're running Windows then if I can get physical access to your computer I can strip off your password in a heart beat and access any of your non-encrypted files. If you use a Mac or Linux, it's much more secure. And if you put your files in a TrueCrypt container (which I'd recommend) then you're also safe. But a non-encrypted Windows file is easy peasy to get if you have physical access to the computer.
So from a stolen home computer, an external HDD stolen in a B&E, a lost laptop/tablet/phone, or even a virus exploit - that's where the real risk to your data is. Compare that to the <100 users effected by that dropbox issue.
Again to draw an air travel analogy, this is just like the people who say they're nervous about or maybe don't fly at all because of plane crashes yet your odds of dieing in a car crash are far far greater.
In fact, statistically the safest way to protect your confidential files would be to only have them in a cloud storage service and not at all on your actual computer! I know you guys will all say "there's no way anyone could break into my house because it's super secure with an alarm system, 4 doverman pinchers, and an armed guard
" and "I'm very careful with my laptop at the airport x-ray plus I never fly
", and "my phone is tethered to my belt via a kensington lock cable
", and "I'm too smart and too careful to ever get a virus
". But crunch the numbers: the safest thing you could possibly do is only have your docs in Google Drive and make sure you don't sync them to your computer. Or actually only store them in an encrypted TrueCrypt container and back that up to a web/offsite service.