There seem to be a couple of different schools of thought on this. Some families place a priority on applying Early Decision (ED) to a school, and thus they plan visits around where they might ED.
Others (and I probably fall in this camp) believe that it is crucial that a student have at least one (and preferably at least two) schools that are extremely likely admits that are extremely likely to be affordable, and that the student would be happy to attend for at least four years. There are students who end up preferring their “safeties” to their “reaches.” But the safeties and likelies are not going to be wasted visits, because chances are, they will admit your kid. For schools that have acceptance rates below 10% or 20%…it might be harder getting any waitlists/denials after the visits. But if you get an acceptance, you can always go and visit afterwards.
That is not to say one should avoid visiting any low probability schools, but that’s not where I would put the priority. If there are low probability schools in the vicinity of higher likelihood schools, then by all means, visit them. But if time/money are limited (and for most of us, they are), then I would use them on schools that have likelier odds than lower odds.