I wouldn't classify them as temples of learning. I would classify them as repositories of insightful thought that bring together engaging teachers that motivate students to learn, through intelligent discourse. Schools are vital institutions that facilitate efficient learning - most of the time. Great schools depend on great teachers and administrators.
I don't believe they are the only institution where people should learn though. Learning also comes from religious affiliations one may have, and in the case of older students, their jobs and organizations they are a part of, including professional organizations.
Much learning comes from private study as well. Schools are primary sources for gaining knowledge and direction in life - but I don't believe they are temples. Proper home schooling can also be very effective, depending on the student, their family, and their particular situation.
There are a lot of things that happen in a school that are not really related to learning. Schools are more than just institutes, or temples, of learning. Schools are the focal point of the community. They are social institutions, as well as learning institutions.
I really think that most schools are temples of order and the status quo much more so than temples of learning. While learning certainly takes place in most, if not all, schools, in my experiences controlling students and appeasing parents are goals 1A and 1B, and everything else is secondary.
We must recognize that "temples of education" was not meant to be viewed literally. Rather it was a metaphor asking us to consider the esteem or value placed on schools. No, schools are not temples of learning. In many communities, schools are not even respected. Consider the growing number of high school drop outs. Consider the growing apathy among students. Consider the parents who no longer want to know what Johnny can do in order to bring up his grade. They now want to know why the teacher "gave" Johnny an F. At one point in our history, education and teaching were valued. I'm not so sure anymore.
The following link gives more information on schools and what the states and federal government ask.
Along the same lines as the previous response, the word "temple" to me connotes not only sacredness, but a sense in which knowledge is conferred on us through some sort of divine action. I don't think that a good education looks like this. Rather, you bring as much to learning as you take out of it.
I think that this is perhaps a little exaggerated. Using the word "temple" implies that schools are in some way sacred. This is a little farther than I am willing to go. Schools are very important, but they are not sacred and they are not the only place where learning can and should take place.