I agree with you 100%. The van just makes it easier for sure. When we pack to the cottage or wherever for a few days we have tons of space left.We have two kids and we have also done many cross country multi day family driving tips. All with four door sedans, Saab 9-5, 9-3 and now a new Jetta. We have never been short space in the vehicle yet I keep hearing people saying they need the van for space, rrrriiiigggghhhhttttt.... learn to pack and only take what you are actually going to use.
Now if we had a third kid the sedans will likely fall a little short, but there are many options without totally up-sizing.
Mind you the first camping trip we literally filled the van to the brim.