Hi,
Can't say I've been able to find the +/- zoom buttons in the browser, as far as I can tell multitouch is the only way to do it. I can't even find a settings option for changing it.
As far as I can see it's only the browser and photo album that uses it. Other apps, such as Google maps still use the +/- zoon buttons.
You are right, it does make things pretty difficult for one handed use, but I think the other advantages far outweigh that (for me at least, obviously everyone has different needs/uses).
I find the multitouch very slick and responsive, in fact if I had a little niggle it's sometimes a bit TOO responsive but that is just something to get used to I guess.
J.