Diatomaceous earth (or another gelling agent) plus alcohol makes sterno if you you want a spill-proof alcohol cooker.
It is also a preservative, so if you were to discover a new species of insect, you could pop it into your fuel bottle for safe keeping.
Water only dissolves polar compounds well, while alcohol is better at dissolving non-polar compounds. Applications could range from cleaning pine pitch from your cloth or pack, to extracting flavor or odor compounds from plants.
I've never been attacked by herds of rabid snails (at least not while backpacking), but my grandmother would leave out beer in the garden to dispatch slugs and snails. They come, drink it, get drunk, and drown in the beer.
While ethanol is NOT good first aid for frost bite, snake bite, etc; there are two cases where ethanol can be lifesaving. Admittedly, these are far more common to arise at home with children or pets, but they are: Ingestion of methanol is treated by getting the patient fairly drunk on ethanol. It displaces the methanol from being metabolized to formic acid by the enzyme alcohol dehydrogenase in the liver. Ethanol also displaces the automotive anti-freeze ethylene glycol, preventing the ethylene glycol from being oxidized to glycolic acid which is, in turn, oxidized to oxalic acid, which is toxic.