@sysadminfromhell yeah - the only time pfsense needs to know about a "vlan" if it needs to understand tagging.
if you just setup native networks on your interfaces.. You can isolate them on your switch by just putting them in different vlans on the switch.
To pfsense its no different than if the ports were connected to 2 different physical switches. Your just creating 2 "virtual" switches by putting specific ports into different vlans on the switch.
This is the whole point of vlan capable switch.. Traffic being tagged is only used when you need to carry more than 1 vlan over the same physical wire. The tag allows either the router or AP or other switch to know this traffic is network X, this other traffic is network Y.. If you don't plan on running more than one "vlan" over the same physical wire you can still put different ports on your switch into different "vlans" and isolate them from other vlans on the switch, etc.