This has been true historically and the current GMAT statistics support the idea, but I've heard otherwise. I was at an info session for the FEMBA program at UCLA on Monday and they actually asked people to raise their hands if they thought it was a good time, bad time, or normal time to get an MBA. The results were pretty mixed, but it was definitely leaning towards the bad time more than the good time. A Part-Time program obviously yields different results than a Full-Time program though, because the applicants already have jobs. However, one could argue that Part-Time programs would see a greater increase in applications than Full-Time simply because people are less willing to take the financial risk of going full-time. It has certainly impacted my thoughts. I haven't committed to one of the other yet, but I'm much more interested in pursuing a Part-Time MBA (UCLA, Chicago, or Kellogg) with 80-100% tuition reimbursement than I was before. If the job landscape become more attractive in the next three years, I could certainly be swayed back to the FT boat.
Either way, you primarily compete with applicants of similar backgrounds. It's probably most competitive for former bankers right now.