You already have my opinion on the disability in your case. I only believe in buying insurance out of need, and not logic alone. My assumption, then, is no one needs the income from two doctors.
I would get an umbrella policy covering your gross income and a bit more; or just update it every so often as your gross worth increases. I dont personally have one yet, and maybe that isnt wise (my gross worth is just shy of 400K), but i do intend to get one eventually.
With respect to umbrella, I believe one's lifestyle has a lot to do with the importance of it. For instance, if you throw a lot of parties at your house, umbrella might be more important. If you work with people in any profession and you represent yourself (instead of, like, in my case where I'm the government, not me) then umbrella is more important. We're no doubt a sue happy country, but obviously, some people are going to be more prone to a lawsuit than others given one's lifestyle. On the whole, my lifestyle should lend itself to low risk for lawsuits. I dont think brewer, for instance, can sue me because i get under his skin daily.