I have not been a very active Fly Fisher, even though I have been doing it since the mid 80’s. I might get out a few times a year. I still don’t have a vest! So that puts me in the “Not much” category. That means I don’t wonder to far from the car or camp. It also means I don’t get my shoes wet , well sometimes I do.
I may have screwed up my vote, as I selected all of the first three rather than just option 3... I saw the "ands" and was lost... Anyway, I tried the wet wading thing this spring. 50 degree water is pretty cold and I like to fish for long periods while also not suffering from hypothermia. Now in Florida, wet wading is ok! So due to my current location, I'm automatically in group 3. I like my vest, but I think I may go over to a sling bag, since this summer may be replete with some international fishing and I don't want to check my vest.
My most important doo-dads outside the necessary rod, reel, line, and flies are my forceps and the waterproof cuffs on my Orvis Pro Guide jacket, but I like my bargain neoprene bootfoot waders too because they keep my toes toasty!
I'd be lost without my vest; it has everything I need and if I forget to bring it I may as well go home. I usually travel 45 minutes to my favorite spots so I like to have a trunkload of stuff just in case.
Like Milt said, "just add water." I'm a minimalist at heart. If I can get away with less, I am happy. Like you, I do not use a vest.
The trip will determine what I will carry. Will one box of 100 flies do? It can for a water I know. I may need another box for a new water. Will I need a net? For most small waters, I won't. For big waters? It could. A lanyard can carry some essentials. A chest pack can do the same. For most the waters that I fish this time of year, I better be wearing waders with good wading boots.
So the moral of the story. Everyone has a comfort zone on what they need. They can be minimalists like me, or they can carry the kitchen sink.
Waders (waters really cold here) jacket (air is usually cold too) rod & reel, spool of tippet and my old leader wallet (it's thin and light) one thin Wheatley 40 clip fly box and my knife & bear spray. Toss in some granola bars and my Katadyn water filter/bottle and I'm good for a 16 hour day (it does not get dark here in the middle of the season)
That's as light as I can go unless I fish from a parked boat and walk away from it. In that case I carry only the fly box and leave everything in the boat unless there are bear tracks everywhere then you gotta remember to clip a spray bomb on your belt. I've never had to use one but try to remember to carry it.
Last summer (2012) I did have to spray a bear, the stuff works well.
I own a couple of vests, but don't need them to fish. I use my waders too, but could fish without them, just depends on time of year & location.
I also have a Army surplus canvas bag that will carry anything extra I need, and an old pair of shoes I like for fishing, so I can make due! In my bag I'll carry a box or two of flies, a pair of forceps, a Swiss Army knife, a spool of line for tippet, an extra leader and maybe an extra reel spool with a sinking line, plus a couple of snacks, that's about it!
I usually carry more stuff than I need when I wear a vest, just to be prepared, but could get by with the bare minimum!
I have two vests that I use, one for trout and one for salt. Plus I have a shoulder bag that's just for smallmouth fishing and 3 boat bags. One warm water, one salt, and one trout.
Some days I'm dressed up like a Orvis ad (Cabala's really ) and other times it's just a lanyard, a tippet spool, and a fly box.
Like all things fly fishing, "it depends"