Yes, people overuse accusations of common fallacies in arguments, because arguing fairly and with good taste has eroded. Arguments are not as formal or respectful as they used to be. Often today, a debate only consists of calling the opponent names, or employing personal attacks. Debating should be more formal and respectful.
Generally, when using an ad hominem argument, there is a valid reason for doing so. Some people see relevance where others don't such as ideologies, past statements, and connections. Depending on the context, some information is more relevant and effective as part of an ad hominem argument than other, but generally it is relevant, and not overused.