This poem isn't about wonder, so much as it expresses wonder. What is the wonderful thing? Why reading, of course. The speaker is amazed and just flat-out wowed by how a simple thing like a book can take us far away – and this sense of awe is also aimed at the power of the human imagination. After all, we are transported by books because we can imagine ourselves in them, and our ability to travel in our minds and souls is what allows us to escape our circumstances, no matter how bad they are, even if just for a little while.
"There is no Frigate like a Book" is simply a meditation on the act of reading.
"There is no Frigate like a Book" is a broader celebration of the power of the human imagination.