Don't go sticking your hands and feet where you can't see and you'll have no worries. I wouldn't worry about the wildlife. I moved here from NY where you could get eaten or bit by other stuff and never worried about it my entire life there, mainly because I knew what I was up against. Just forget everything you've heard, read up on them, and relax.
Step a little heavier when walking at night around dark brush / bushes, drag your heels on the pavement a bit, chances are the snakes will move away from you or stay still. You should still be aware of your surroundings, especially when in quiet, undisturbed areas.
There are around 60 varieties of snake in FL, 6 are poisonous. Most all of them bite when threatened or startled. In the unlikely event you are bitten, dial 911 and get to a hospital, but don't freak out. If you can do so safely, get a picture of the snake and its markings, or get a real good look at it or tell the first responders where it went in case they're interested in finding it.
They're hiding in cool shady spots or from people most of the time. If you have to go into bushes and brush where you might step on a hidden snake, do so with extreme caution and use a light if necessary. Unless you're doing yardwork on your vacation, it is not likely you'll have an issue. If you see one in the area of kids, keep the kids away from it and bring it to the attention of management / staff ASAP in case they're concerned about this snake. Doesn't hurt to peek under your car(s) as you approach them in case of the occasional snake or gator that made it there. In the back seat and under your front seats in case your car has a hole in it.
I've been up close and personal with a couple. Walked right past this guy under a bush, about 2 feet from me. It was more interested in a rat walking towards it. Got in my car, turned on the headlights and watched him lunge for dinner. Security was quite interested in relocating it. What's the first thing kids wanted to do when they walked past us? Run to the bush and see the snake. I cowered in my car, providing light and shooing children away, the guard jumped into the bushes to pull it out. Claimed he had been bitten a few times in the past (wonder why). Venomous cottonmouth.
Met this guy at Fantasia Gardens while mini-golfing, about 6 feet away in the brush by the lake. WDW keeps them around to control the rat population for free, since they are natives. Black eastern racer. What's the first thing the kids want to do? Run to the bush and see the snake. (see a pattern here?) Staff knows the snake and is not concerned. Mention it to a CM in case they want to relocate it and avoid a panic.
So as most kids who grow up around snakes learn, some after they are bitten, don't eff with the snake and you won't get bit. Distance is your friend since they can only strike about the length of their body (watch out for 50 foot snakes) Chances are if there are a lot of people around, the snake is cowering in a hidden spot, and will not be coming out any time soon.