No you are right, a lot of people reckon code 55 is a good option and rightly so, my comment was in no way meant as a criticism by the way. I know full well the track dilemma, having had baseboards built for a few years now whilst pondering over which track to use, to the point of buying a load of code 55 which I'm now not using and I've now dived in a had all the track for my layout built using finetrax (I've no interest in doing it myself so someone built it for me). The layout is stalled until the winter but I've got 20+ sets of finetrax points made plus all the flex so it'll be interesting to see how that works out.
Like you I had concerns over its strength, not because I'm exhibiting in this case, but just because I have young kids. Saying that the early signs are that there is nothing to worry at least witht the plain track. I found that once the ballast was down (I've made a few test pieces) the whole thing really firms up and feels really rather robust. I've not yet had any real world experience with the points though which could be a different kettle of fish, I don't know yet.
Either way, code 55 still looks very good as your layout shows.