I’ve used it on my phone a lot recently. From the pulldown menu, you go to WDW, then hotels, then room finder, then scroll down to the list of hotels and click the link to view rooms. From there it has the same dropdown menus to select room type, etc.
The one thing I have difficulty finding now are the graphs of wait times for particular rides per day. I can find it but it always takes me some time to remember how.