We stayed on Legacy Park last year and the quickest way I can think of to get to WDW does involve a drive to the 192.
Head north on the H27 and then take 192 east. Just past the Publix at the junction of the 429 there is a left turn for Black Lake Road. Follow that to the next T-junction and take another left onto Sherbeth Road. Follow that road along and round to the left and it takes you right to WDW. If you have Google Earth I would be happy to email you a pin of where I mean - just send a PM.
Mrs Pegasus