We went camping for the first time last week...
and loved it!
There was plenty of room in the tent (Vango Tigris 800) for Dp, myself and our 3 DDs, but there was stuff everywhere. Not just clothes and items of every day use, but also the tent bag, pump, you know, all sorts! 
So would it be a good idea to get a small tent to store these things out of the way? Or would it be yet another item to pack with us? (our truck was full up!). I was looking at the small pop up tents from Decathlon, what do you experienced campers think?
(and yes, I need to majorly downsize for our next trip, but did use most of the things we took with us).