We've stayed at WBC twice this year and have two more trips reserved. After staying here a few times we decided to buy into the timeshare. My perspective is from someone in their mid-forties with kids that are college-age, I don't have much advice for kids activities (I'm guessing it will be a while before we hit the stage of grandkids).
We live about 10 hours away. Sometimes we drive, sometimes we fly. When we fly, we use Lyft. It is about $35 to and from the airport and about $10-12 to and from the parks. If you have 2-4 people that don't need car seats this is the way to go. Compared to the shuttle it is less expensive, more direct and works exactly on your schedule. Magic Kindom is the only park that is a pain because you are dropped off at the ticket and transportation center (the shuttle will also drop you here). If you don't mind a little walking, I'd request a Lyft from WBC to the Contemporary. You can walk over to Magic Kindom from there. In all honesty, I prefer to drive our own car. I prefer it to shuttles, Disney transportation (when I use to stay onsite) and rideshare. But, it helps that we are annual passholders and get free parking at the theme parks. At $25/day parking could add up pretty quickly. We did see peope using the Minnie Van service at WBC, but the additional cost was not worth it to us.
I don't have any advice about what unit you will be assigned. Only certain membership levels can request specific rooms (we will never be at that membership level). When we show up for check-in we typically request a pool or nature view room. We've been happy with our rooms but realize that sometimes we may end up with a parking lot view. Someone has to stay in those rooms.
When we fly, we place a grocery order at Publix via Instacart. That way they bring the food to us and I don't have to Lyft to get it.
We have struggled with the air conditioning not keeping the bedrooms cool enough in the night. It helps to keep the master bedroom door open, but sometimes that defeats the purpose of having a master bedroom

. I will be saving the instructions from earlier in this thread and try it on our trip in September.
I usually bring a ziploc bag with a few Tide pods and half a dozen Bounce dryer sheets. I rarely run out of kitchen soaps and detergent but sometimes I need more laundry detergent than they provide.
We haven't joined in any resort activities, but I do enjoy floating the lazy rivers and using the hot tubs.
Enjoy your trip!