When going to the MK if we are not at BLT we also avoid the TTC at all costs, we don't like it very much. We will cab to/from our resort to the CR and then walk to the MK, works great but there is the additional cost but we don't mind.
Would valet parking at CR cost nearly the same as a taxi?[/QUOTE]
it's really a moot point if just planning to park a car there. valet parking @ the CR is intended for guests of the resort or those having an ADR there. Every time we check into BLT we notice how vigorous the guards are as to checking cars at the gate, but it's good thing since parking space is limited there.
Type A people (we know who we are

)
always want a vehicle at their disposal. However, we find it nice to have the option of free public transport within the parks if we plan on having a drink or two with dinner one night & don't want to pay extra for a cab.
we've used ME for shorter trips and survived but had to remember to work in extra travel time from here to there within the world.
jmho if you have any sort of mobility or balance issue or have small children in tow, the bus can be problematic if you have to stand.