There is a point where broadening your definition of something makes the definition next to worthless. If there are a couple dozen planets in the solar system, many of which are just big asteroids that act like asteroids and not planets, then you're having to create a new definition for "real" planets because of all the garbage collected in the broader definition.
The word "Planet" should mean something apart from a round object that orbits a star. It should mean something that makes you understand basically what it is and what it isn't and the ramifications of it's existence. I should be able to look at one planet, and a second planet and go "yeah, those are planets". Since I was a kid, Pluto has always been the "weird" planet, the one that didn't operate like the others. So when it lost it's "planet" status, it seemed natural to me on some level.
Who cares if it's called a "dwarf planet"? Who does this harm other than the discoverer of the planet, or those that are obsessed with the idea that it MUST be a planet? Whether it's called a planet, a dwarf planet or a bagoglifunkle, it's still a large object in the Kuiper belt that should be known of and studied. Most people didn't even know are Ceres, but it's got a mission going to it, even though it was never called a "planet".
Seems like a lot of wasted energy on both sides of the argument.