Right. Most saisons, some Bieres de Garge, all witbiers, and most sours have pretty low to moderate alcohol content. There are a few Belgian lagers, most of which are pretty small. Hell, there are even small Trappist beers. No, they don't usually make their way to the US, but they are brewed.
As to why the big ones seem to get the hype - that's only partly true. The big beer lovers of the Belgian style are no different than ones of any other style of big beer. Count the number of times we have threads with people waxing poetic about barleywines, RISs, IIPAs, and the like. Now compare that to people doing the same about small beers (light lagers, cream ales, milds, etc.). The small beers may be what we drink the most of, but when we're in the mood for something huge, those big beers deliver in such a marvelous way, it's tough not to get stoked about it.