Well yes, every tab gets a separate thread and memory space, and cannot crash the other tabs when one hangs. With of course the lovely exception of Flash, as that hooks back to the same single library or something, and when that dies for some reason everything goes down with it.
Interesting, IE 9 doesn't exhibit that behavior. If flash crashes a tab only that tab goes down and is recovered.
You need them in the toolbar? I prefer shortcut keys for zooming, for those rare instances that I need it. Just hold control and scroll your mousewheel.
I prefer the discrete steps in the toolbar myself in IE. With my aging eyes it's nice to easily bump a page up a set amount (100-125-150 percent) if it's just a bit too small to read comfortably. If I need fine grained zooming, then as you said ctrl+mousewheel works decently enough. But for quick pre-determined zooms, toolbar controls are optimal, IMO.
That said, I've recently started trying Chrome. And I have to say it's nice that it just "works." But so many things about it annoy me even more than IE 9 (versus the superior UI of IE 8). Like, for example, I haven't found where to enable pop-up blocking in Chrome. That's probably just me, but considering it's so easy to do in IE, it's rather annoying that I haven't found it in Chrome.
As well, the crash recovery doesn't seem to work consistently. Sometimes it'll offer to reload tabs that were open prior to a crash and sometimes it won't. Meh, still not good enough to replace IE for me, despite IE 9's annoying UI. Wish I could have kept the UI from IE 8, that one was just about perfect, IMO.
There's other things about it that annoy me, but all in all, it's a nice browser alternative for people that don't want to configure anything and just want something that works.
I still use Chrome though. It's handy to use in conjunction with Sandboxie for Flash videos so that I never have to enable Flash in IE and thus open up a potential security hole.
Regards,
SB