Forgive me, but I have to play devil's advocate here...
It's not really about how scary the ride is. The point of the measuring is to make sure your child will be safe on the ride...believe me, if you took your slightly under-height child on the ride with platform shoes, stuff stuffed in their shoes, etc, to ensure they could ride, but then they ended up getting injured because in fact they were too small to ride safely yet, it would be a liability issue, among other problems. They're just looking out for your child's best interests, not trying to ruin your day or spite you. And as for Splash Mountain measuring more, that's also the ride with arguably the least restraints and so forth to keep anyone safe. It's also one of the rides that people have been seriously injured or killed on (albeit generally due to their own stupidity, not size). I don't know what to tell you about inconsistency on the measuring issue... some people are just more lax about checking such things, and as to whether that's good or bad, I guess that's up to you... But please, don't be mean to these CMs if they insist on checking again...they're just doing their job. How incredibly horrible would they feel if they just ignored the guidelines, only to end up with a child dying or having a serious injury as a result... Believe me, I can still remember being little and wanting so desparately to go on the "big kid" rides and it's hard dealing with a child throwing a tantrum...but I, along with many other children, have survived and looking back, I know that my parents were looking out for my safety. No matter what, you kids will have a good time. The best thing is just to not give them the expectation of riding in the first place. If it works out otherwise, then it's a bonus, not an expectation. Anyway, just my 2 cents.