I think DADGAD, Dropped D and double-dropped D tunings are great for variety and increasing versatility. Other tunings too, why not?
I play stuff like Big Yellow Taxi, Vincent Black Lightning, Diamonds on the soles of her shoes, and Words of Love etc with a double G bass (E up to G, A down to G) – easy to play (well, apart from Vincent BL which takes a bit of practice!) and a good big sound.

I played DADGAD almost exclusively for a while (very seductive – great sound, easy to play and develop) but eventually went back to standard and found I was prepared to experiment much more because of my experience with open tunings. Also saw Isacc Guillory at a couple of gigs and asked him about his tuning (expecting him to tell me it was some form of open tuning) and was very surprised to find out he was in standard tuning. That convinced me I needed to push my own barriers further outward. Guillory's guitar playing was out of this world – I've got no chance of ever getting anywhere near that of course, but hearing it made me push on with my own playing in standard tuning, and I'm very grateful for that.

After playing DADGAD for a while I re-visited some of my favourites from the 60's, including Davey Graham, and was able at last to see how the magic of his guitar was achieved – via open-tuning – and not nearly as difficult as I used to think. I also started experimenting with some Buddy Holly songs in DADGAD, slowing them down and playing around with the melodies to suit. I like to think maybe he'd have re-visited his early work and done something similar………..

Variety's the spice of life – but my advice would be not to turn your back on standard tuning.