I live in a Victorian terrace that suffers from a bit of rising and penetrating damp (all stuff that I need to fix when I have the money). On top of that, I noticed recently that I also get a lot of condensation, particularly in my bedroom where I often have clothes drying.
So after much deliberation I bought a dehumidifier a couple of days ago and I am converted. Clothes drying faster, no condensation on windows and the whole house feels less damp and warmer.