You have to really not be paying attention to fail to notice that one of your springs has broken. Pretty noticeable difference in throttle resistance.
Tin-man: run 2 springs, check them as part of pre-flight if you want to and pay attention to how your car drives and feels and you won't have any problems. Heck you can replace them once a year if you want as part of your tune-up for a few bucks.
Also, more importantly, pay attention to where your floormat is going....that probably causes more "stuck throttles" than anything.
Relax and stop sweating this issue.
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