I have never lived in an ants-free-house in my entire life so my opinion is biased. As long as they don't march in columns through my house I have no problem with them and leave them alone. Only on the mainland of Belize, you have to leave your house for a few days when the travelers ants come in (they leave your house cleaner than clean afterwards though).
Leaving a dirty orange juice glass overnight is nothing, canukgirl; when you really have them trained you can leave your dishes dirty and they will clean them for you in a few days, so they are ready again to use! Look at the bright side of nature!!
<<Sigh>> some people are just meant to live in concrete... and yes, you can kill the lil harmless sugar ants with the poisonous drops.