Hi Alessio,
I think you have drudgery ahead of you whatever you do.
However, here are a few pointers that may be helpful.
- If you haven't already, change your preferred editor to Plain Text - that way you're not having to change it every time you go in to edit a page - you'll see the html straight away.
- Create one page with an embedded YouTube video.
- If you can, install the mass actions block and duplicate your page over and over again. First you can duplicate 1, then you can duplicate 2, then 4, then 8, then 16, etc. so it won't take so long
- Then go in to each page - maybe open 10 at a time in tabs. You'll need to paste in the Video name in the title, and just replace the video ID in your embed code. The rest of it won't change anyway.
Put on some good music while you're doing it and it won't be so bad!