Epoxy is required for firewalls, joining wings, attaching wing hold down components, attaching the empenage, landing gear blocks, etc. - any place under high stress. I learned to build before CA came out and prefer to use alaphatic resin, otherwise known as carpenters glue (Titebond II, Elmer's Carpenter glue). I do use CA on some occasions, but don't care for the fumes when it flashes off so I use it sparingly. For the rest you can use a variety of different adhesives, and it all comes down to what you like to work with.

Hogflyer