Sure it does, but those cycles tend to occur over the course of centuries or more; this one seems to be happening on the order of decades, years even.
I almost wrote a whole big edit describing the ways this time was different from previous warmings and coolings, but I'll just sum up by saying that people who are concerned are so because the warming is not only occurring at a faster rate but to a greater degree than previously. The most recent warming periods before this saw 0.1-0.2 degree C change, and the most recent cooling around 1-2 degrees. Over half the time we've already covered that ground, and we're expected to take up at least a 2 degree change since 1850 by the year 2050, and some predict by 2100 we'll have hit a 7 degree change.