Not at all. For my entire life "my pleasure" was a common reply when one said "thank you" in this type of setting. Somehow in recent years that response has morphed into "no problem", and THAT I find creepy. No problem? Of course it's not a problem. It's a mindless dumb reply.
You probably hear "my pleasure" here for 2 reasons - one, the employees are actually trained, unlike many fast food employees nowadays, who just want $15/hr for showing up and doing a shitty job. Secondly, have you ever seen a CFA or In-N-Out burger employee who actually seems to hate their job? They don't exist. So "my pleasure" is a totally appropriate response when it's sincere.