I love a long hot shower and it's the easiest thing to dry your skin out.
What I would suggest for anyone struggling with dry skin and the shower is:
Try try try avoiding hot water and if you do get those important parts clean and jump out.
While most soaps and some body washes can be high on the ph scale, try using ones that are natural.
Research which herbs and oils (that are used in natural soaps) that are excellent for dry skin e.g. jojoba oil, olive oil, coconut oil, neem oil).
Moisturize with a ph balanced cream (not lotion, unless if you prefer lotion).
I like buying ph strips and testing all my products to see which i should use and which I should toss.
It's all about researching, experimenting and using what works for your skin.
Hope this helps