Yeah I do get other people's email, but it seems to be more the sender's mistake than gmail's. My email is samuel.le@gmail.com, and people seemed to have been wanting to reach Samuelle <something> (Samuelle is a first name), Samuel Le <Something>, Samuel <something> Lee, etc. So far I've received an email from a sales person in a bank in Hong Kong offering me to buy some commodities derivatives, a non profit organization that takes care of mentally handicapped persons, a mover in the US, someone else flight ticket confirmation, some stuff written in Hebrew by a Rabbi, and many more...
When the mail seems legit I reply to the sender explaining they sent it to the wrong person, and often they apologize. It happens roughly every month/two months so it's not a major annoyance and so far I haven't received anything super confidential or personal.