York-Ster, here's what I will concede...
Overall Economy is Good, what Companies survived r making good coins, spending of a reasonable nature is continuing and activity is GOOD for Everyone!
That said, the valuations r out their reasonable range but can do so indefinitely, especially if the Economy keeps plugging forward and 401K deposits keep pouring in and fueling prices Higher...
In Fact, one could easily support the argument of people feeling really good about things if one references the Statements most received for the 1st Qtr, hence, more fuel for higher prices and, well, Activity!!