I would say it can certainly lead to sins very quickly and very easily, because you are not fully thinking through what you are doing. Maybe in driving an all-terrain vehicle it might not be such a bad thing, but in the spiritual life it can be foolish, and sometimes downright disastrous.
For instance, what if you went on a whim and just got married spontaneously, to the WRONG person? It could hamper your spiritual life for the next 50-60 years. What if you went on a whim (or as they say, went out on a limb) and quit your job to start your own business without the guidance of the Holy Spirit, and spent years trying to get a failing venture off the ground for nothing. What if you invested your savings in something on a whim and lost it all? And in your personal life, what if you walked away from someone on a whim due to frustration only to find out years later that you were called to serve God with them? What if the same happened with a church God had called you to be a part of?
When guided by the Spirit, you have to measure your responses, like to everything. There is a verse in James that says God is untempted by evils and He tempts no one. That essentially means He is not going to be goaded into responding the way the enemy wants Him to. If He responds, His responses will be His Own - something He fully thought through, and not something He got coerced into based on His feelings in the moment.
What sorts of things are you referring to specifically?
Blessings in Christ,
Hidden In Him