Historically, you are 100% correct.
Which moves me to my point in bold - that did NOT happen from '06-'08.
Sure it did, Jeff -
2006 mid term - House - Dems gain 31 seats
Senate - Dems gain 6 seats and the majority
In this election you had a number of retiring Dems in red states and no Repubs in blue states defending their seats. I was surprised at how many results were much much closer than I expected. Not too many surprises in the results and in most of the close ones it was all about turnout which, as often happens in the mid terms, hurts the Dems.
No major realignment here. 2016 in the senate races has strong factors favoring the Dems and the electoral vote alignment would be very tough for the Repubs to overcome...which is why you have some efforts in states like Michigan to change the law to split the electoral vote (note that there aren't any red state politicians trying to do that.
Speaking of Michigan, I was back in Mackinaw City and on the island in October (10/16-20) as well as a day trip to the UP and Tahquamenon. Trying to convince my 20 year old daughter to work up there next summer like dad did in his college days. Not sure I convinced her but she did love it ... planning to take the family to the island next summer. Can't find anyone here in Mass who's heard of the place....