Do you swap skills on toolbar ?

Do you "hot" swap which skills are active on the toolbar (and have more skills socketed than you have toolbar slots) ? I mean for example you have curse x on your toolbar but encounter a mob where curse y would be better, you swap to curse y. Or do you even swap gems?

I usually don't swap other than when I know from the beginning that it would be better to some specific skills. But I am thinking of starting to do it. Swapping gems when in an area seems to be to much trouble but hotswapping on toolbar works I think.

For some characters I have my Lightning Warp on my weapon swap, which is much easier than swapping on the skillbar or gems and leaves an extra socket. That might work for curses too, I believe I saw it in a video somewhere (that the curse persists even if you swapped out the gem/weapon).

On my Frenzy/LA ranger I've been playing with a PB Puncture Trap on bow swap just for rares and bosses and it has been working out great.

I guess the true skillbar swapping I do is when I get to a map boss and I change one of my skills to a charged up Vaal skill to use on the boss (ie. Raise Zombie for Vaal Summon).

As a summoner, definitely.

The skills I use (not including 4 auras) are:
Enfeeble
Vulnerability
Arc
Desecrate
Flesh Offering
Summon Skeletons
Vaal Summon Skeletons
Raise Zombie
Raise Spectre
Lightning Warp

I usually don't have on zombie/spectre after summoning them initially because they rarely die. Also, I keep Move Only on the left mouse button. I wish we had more ways to set up hotkeys. I actually use all of these skills on a regular basis in every map (Vaal SS only 2-3 times though).

I use up every slot on my summoner, and still need more. I have dual-curses, which I just switch out on the hotkey bar when doing curse-immune monster maps. Most of the time, I still have to change something to EK temporarily for pot-smashing.

Do Auras count? I run 6 Auras, but only keep 3 of them on the Skillbar.
I also have Portal on Weapon Swap, but that's not really that relevant..

I swap my 6-7 auras on one slot. On one lone socket, I cycle in town between purity of elements, enfeeble and bone offering depending on the maps mod.

I don't do any on-the-fly swap because 1) I'm lazy and 2) it goes against with my playstyle concept.

I only swap out the Auras after I activate them. Nothing else, except maybe Portal on the "X".