The latter two sound like business uses. The article is about personal use of personal vehicles.
> Kids, gear
Even then, a sedan or utility/mini van can do the job at much lower costs.
> boats, ATVs
Boats and ATVs are also good examples of money pits that prevent people from saving for retirement.
(Especially boats. I looked into buy one, and quickly noticed that I'd have to be on the lake like half of in-season weekends and/or use all my vacation during the summer before ownership beat renting. But I'm only on the lake a few weekends a year, and even then only need/want something other than a kayak maybe every other visit.)
And again, the conclusion of the article is "But if you’re one of the many people who are woefully unprepared for retirement or any of your other saving goals, a good place to start would be cutting back on any unnecessary spending on transportation."
If you're on track to retire, go ahead and buy that nice car/boat/etc. But if not, maybe consider cheaper alternatives.