Bought my first house when I was 22 or 23. Had a survey done before I closed really just on recommendation of the realtor. Apparently a previous survey had been incorrect and the propertly line had a new pin installed on one of the 4 corners. Even while I was moving in and nieghbors were bringing goodies or stopping in to introduce themselves, the elder gentlemen's dad from next door (his dad lived on the other side of him) came down and started raising cain with me over the property line and telling me that 8' strip of land was his. I didn't disrepect him, but found the guts to tell him directly that I paid for the survey and that's where they put the pin so unless he wanted to pay for his own survey to confirm it or move it again, I would treat that as my property as long as I lived there.
Funny thing is though that that sliver of land was nothing but unusable hillside and I had to tend to it all the years I lived there with a weedeater. Who was the smart one? Maybe the old-timer.
I have gotten a survey on every land or home purchase since then. Worth the peace of mind to me.