It may or may not include young boys, because it really all depends on the quality of the voice acting! It's very common for adult women to voice young boys in cartoons (example, Timmy Turner and Spike the Baby Dragon are both voiced by women!), especially since they can be counted on a consistent voice quality whereas a young boy not so much; When he hits puberty, his voice will deepen and ultimately may have to be replaced in order to preserve the voice of the character. In this case, when it comes to a person voice acting a young boy, it's really about how well the voice acting is.
That being said, the issue is more likely to crop up with older male voices, teens and upwards. Producing a masculine-sounding vocal isn't just about pitch, you have to match the resonance and other details that I can't recall right now. It takes care to voice act an older male voice when you have a feminine voice, and for some that may be very very difficult.
Do I personally dislike young, shonen-like vocals? Not specifically, no. I don't tend to seek them out simply because they aren't my style, but I think there is a merit to that voice type- especially since it is higher up in the range, and less likely to get muffled due to UTAU being...weird.