If I feel I could do with seeing what someone else has on a particular person, via their tree, I simply use the search option from the top tab and use the drop down menu to select 'public member trees' for that name/place/date. A convenient box appears indicating how many trees that person is in and if you then click 'view all' you get a list of them.
Conveniently for the public trees it tells you how many records & sources these trees contain so I go to the couple or so with the highest records and sources.
It dispenses with getting every 'tree' thrown at you and generally guides you to those trees that might be worth looking at. I assume that those people who have bothered to attach records & sources are those people who do thorough research.
Pheno