I let them continue on, or walk them out on a bit of paper if they sneak in, huntsmen are great spiders to have around, they really keep the fly and mozzie population down, and unless you really corner them they are passive.
Now for any new visitors, if you park a car under a tree, clean the gutters, or they will happily live in the boot or bonnet gutters leaf litter even in full sun, you will drive off and a few minutes after the engine heats up they will scamper to the door seam over the windscreen in order to cool down,
now being the paranoid person you are you now have a fairly harmless spider waiting in the door seam that will either fall or try and run in when you open the door, and like the poster before you have a hard time telling your brain its harmless.
Funnel webs do very much scare me, though i dont check my shoes, as i never leave them outside. the golden rule (at-least for Sydney) if its big but skinny your OK, its is big and very fat its a problem,