I was able to copy/paste a lot of my SOP and then change a few sentences and/or the opening and ending to make each fit more closely. Definitely not for all ten, but for many this was the case. As for the applications themselves --filling out basic information about myself, transcripts, etc.-- I started my accounts in September and chipped away slowly every weekend. This was KEY for me because since all of that crap was done so early, I was actually able to sit down and double check/submit all ten applications in one weekend.
I asked for letters in the summer, and they were uploaded in November for the most part. My CV is a document I constantly updated and polished, and I didn't submit a writing statement. The GRE is what threw off my whole system because I ended up having to retake it. So, I had to pay for an extra test and lose quite a few shifts at work from studying and sitting for the exam twice. It's definitely not easy! Don't feel stupid for the number of programs you applied to. Everyone applies to different numbers for different reasons.
Seriously, so expensive. I was building up my savings account for months; I set aside roughly a thousand dollars to apply, deal with ETS, and order transcripts from two colleges.