The type of crosswalk I'm speaking of, on Federal Street by Monument Square:
Example of a less permanent crosswalk on Congress Street:
There are some good examples of these permanent crosswalks around the peninsula, and I say there is always room for more. They of course are more expensive than painted crosswalks initially (perhaps depending on the material used), and do require upkeep (to keep the crosswalk accessible to all users), but they usually look more attractive and can be safer by not fading and being more visible to motorists.