Life after aliens come and take over won't be as super fun as you might think, of course there will be no hunger and hover trains along with using their alternative energy technology will make day to day live much easier and cheaper (if they allow us to keep a monetary system?) but with every large change in the structure of society, a unique set of challenges is thrown up to overcome.
Would you let your daughter marry an alien? I would, but then I'm not a hateful bigot, it's a good chance our friends from the stars are going to want to participate in our customs and dating/mating will be an area they may be really keen to get involved. Be careful how you react when your son brings home a young alien overlord for dinner as being vaporised in your own home is not the heartwarming last memories you want to provide to your family.
I guess we'll all learn their language eventually, but for older humans that are a bit stuck in their ways expect to see a lot of vaporisation incidents after an alien has lost it's temper after having being repeatedly spoken to in a condescendingly loud voice in some customer service situation.
While I'm on the subject of customer service, these organisms can't expect to take over a whole planet and that everything will run fine! I just hope they have the foresight to instigate an efficient customer/slave service program. I would assume feedback is essential when building a multi-planet slave corporation anyway.
So there's a few bugs to work out but it's going to be great, and if an arriving alien needs to probe you don't be a big baby and cry about it, they're only doing their job.