Wigjig - Have it, use it, like it. I use it mostly when I need to make a bunch of the same thing and they all have to be the same size. Yes, you can do the same stuff (mostly) with round nose pliers, but sometimes the jig is faster and easier. Say you have a squiggle that you've sketched on paper. I like to place the clear acrylic wigjig over the squiggle and line up the curves with the holes in the jig. This tells me where to place the pegs, and which sizes to use to get the radius I need. Then I can tape down the paper and make as many of the squiggles as I need. When done, make notes on the paper as to which size pegs were used and you've got a permanent template.
Goggles - no, but I wear glasses plus I always cover the wire before cutting so there's rarely anything launched.
Step pliers - Depends on what you like to do. The nice thing about them is that if you are going to make a few jump rings, you can be sure they are all exactly the same size because each "step'" is a constant diameter. When you try the same thing with round nose pliers, it can be done well with some practice, but you will need to be sure you coil each one in exactly the same place on the pliers or they will be different sizes because the pliers are sloped. I don't have step pliers but I do have the bail-making pliers and I like them.
So......when prioritizing your tool money, I would put step pliers on the "optional" list until after you have good quality flat nose, round nose, chain nose and cutters. HTH