I wouldn't try something complicated like a traction splint unless there was really no other option and possibly even then--not sure they even teach it in WFA any longer. But, for the most part having a weekend class to refresh a lot of first aid isn't a bad thing even if you don't practice it all the time, may have forgotten some of the details, and maybe your splints aren't the world's greatest. But so long as you're cognizant of your limitations having some even somewhat stale first aid training is probably better than having none.
[Of course, if you act like your 10 year old WFR or W-EMT cert means you're qualified to charge in and take over because you're "certified" that of course can be an issue.]