I think it's actually easier to negotiate a spousal hire (TT, clinical, adjunct, what have you) when people are in the same field than not. My spouse is a humanities PhD, and I think it would be very hard to justify a spousal hire in a department that has NO affiliation with psychology (or vice versa). We managed to find faculty positions at two different institutions, only 30 min apart. But we recognize that we are very lucky.
And no, being married to someone else in academia does not drive me insane! In fact, it's helpful because we both understand the culture of each other's jobs, albeit in very different fields (perhaps that is the balance you were referencing?). Plus, the flexibility of academia is great when you have children (as we do) - given that we are both in academia, there is double the flexibility. The dual academic lifestyle is quite nice, in my opinion.