appreciate the feedback. i haven't yet signed up for google+. does this mean there's some google+ account out there w/ my name and my photos from my phone?
You should sign up for Google+ even if you don't use it. As a Google+ member, you can upload an unlimited number of photos sized less than 2048x2048 and videos less than 15 minutes. When syncing photos from your phone or computer (unless you choose to change the settings), it will automatically resize the photos so their longest size is 2048. Photos from your Nexus will be resized to 2048x1536, which is approximately 3 megapixels and is still more than large enough for prints.
If you don't sign up for Google+, then any photos larger than 800x800 are counted against your storage allowance, which is 1 GB for the free account.
One thing to note, is that if you upload a whole bunch of photos on the free account, you will eventually hit a limit. It seems the limit exists to prevent spamming. For instance, I signed up two weeks ago and then started uploading a decade worth of photos. Around 11,000 photos, I hit a limit and the uploader started giving me an error. Since all of my photos were less than 2048x2048, I hadn't used any of my 1 GB allowance, yet I was still getting an exception in the uploader that implied some upload limit.
After some google searching, I found that other people who have had this problem solved it by signing up for the 25 GB upgrade. There was also a statement from google implying that it was protecting against spamming. As soon as I upgraded my storage, I was able to upload photos again, but have still not used any of my storage allowance since all my pictures are converted to 2048x1536. I figure that the credit card used to upgrade my allowance proved that I was a real user, not a spamming computer. I plan to cancel my upgrade and return back to the 1GB account since I'm not actually using any of the upgraded storage space.