I did 4 week long holidays before going on discovery weekend. For me the weekend was a bit frenetic as you do not have the time to meet people over just 2 days, and it all felt a bit rushed, however I did enjoy it, but if there is a full holiday that takes your fancy just go for it, and remember if people go on these holidays, its because they want to mix and socialise with others, so you are not going to spend time by yourself unless you choose to, and its all down to the personalities on your tour group, so obviously each tour group is made up of different people so each holiday is going to be different, but I've never known anybody left out, it just dosen't happen.
Ange S