Yes I too have grown used to NoScript and for me it is a better option, block all and opt-in (whitelist) to those you want to allow. This evening I have been doing some browsing and I was having to continually temporarily allow sites permission to run scripts, yes it was a bit of a pain but not to the point I would drop NoScript for something like YesScript.
Whilst the YesScript differs in that you are opted-in by default allowing sites to run scripts (at least that is how I read the add-on page) and you then blacklist those you don't want to run scripts.
To me that is a step too late as how do you know in advance what script might be run, effectively you are relying on the better security in firefox and your security applications and proactive measures you might have to protect you, thanks but NoThanks.