Yeah they do; incorporeality works on bosses, too.
My wf monk tops out at about 550 hp, which isn't all that high, but she can very smoothly tank pretty much everything except elite horoth, though I might be a little nervous on hard. Shadow Fade is one of the strongest tanking tools in DDO. Cloudkill+Shadow fade on a boss is tremendous damage mitigation, especially when topped out with improved evasion. The main thing standing between me and tanking a lot is how much of my threat is sneak attack based (a lot), and consequently being a lot better not doing so.
There's also no reason a monk has to have less healing amp than a barb, and a lot of ways it can have significantly more.
I don't get how you guys equate using less than 5 moves every 4 seconds to never using those moves and being a glorified barb. There's a happy medium between 'playing monks gets you carpal tunnel' and 'never using your special attacks'. You guys can try to say its taking the skill out of playing monks, but really its just changing the skillset: instead of it being about how many ki strikes you can hit and keep yourself in melee range at the same time, it will be about keeping track of a resource and using your attacks with more precise strategy to target mobs vulnerable to each attack, instead of just stunning the closest mob and continuing the way we do right now. Monks already have unprecedented mobility abilities for this task, and it will be very strategically demanding to ensure you use your stuns on the targets they're most likely to work on, and save things like void4 or touch for the ones that won't stun. You'll less be able to afford whiffing or having something save, so you'd better pick your targets more effectively. That will be extremely skill-testing, and I doubt I in particular will even be that good at it.