What a interesting thread!
During my 33 years of ministry, 22 were spent in local church ministry and 11 in a parachurch executive role. Permit me a few observations from both sides of the pew.
* Pastors in America typically average 55-56 hours work per week. That is nothing any more or less significant than many other similarly educated professionals.
* Much of the issue of "overwork" has to do with the condition of the road rather than the miles on the odometer. Serving as a full time associate pastor in a congregation of 200 back in the early '70s, was much different from trying to build a church from 35 to 110 or as senior pastor of the congregation with 500 coming on a Sunday. Today, I spend my time dealing with attorneys, investment bankers, architects, staff issues, ceremonial occasions, disgruntled residents and their equally disgruntled families, sessions with industry regulators, more meetings than one can count, etc. The "stress" of trying to pull off a $45 million project in this economy is killing me! Nevertheless, my current ministry is the easiest of my life (compared to the pastoral ones). The contentious congregation with 500 attending on a Sunday and about 1,000 opinions on how better to do my job was the longest root canal (10+ years) of my life!
My respect for pastors is unbridled. Yes, there are lazy ones as Ben suggested (although many pastors I know consider military chaplains the ultimate gold brickers of the clergy universe.

Guess it all depends on which stereotypes you believe.

). But, all in all, they are a diligent, Godly, hard working lot who deserve more honor (and honoraria) than they receive.
* My "take" on pastors (as a class) is that many of them suffer from self-inflicted wounds. Maybe the Reformed brethren are better educated in business and finance than the majority of my Baptist colleagues. But, a good deal of the problems pastors in my tribe have had in their congregations traces to sheer ignorance of (and neglect for) sound business practices and skills (e.g., something as simple as being able to read and differentiate the balance sheet from the other financial statements). Just remembering "luo, lueis, luei, luomen, luete, luousin," having read Bavinck, or being able to parse rare hithpael forms in the Pentatuech does not a minister make. Believe it or not, even if you are a TE, Sr. Pastor, Lead Pastor (whatever your nomenclature calls you), you have GOT to know something about management, leadership, and finance. The current fascination with the MBA/CEO pastor is disgusting. But, that does not excuse an obscurantistic head in the sand when it comes to the business side of ministry.