What are Wordsworth's feelings about nature?In these poems: "The World Is Too Much With Us," "Westminster Bridge," and "Tintern Abbey."

Nature in the Wordsworth poems you ask about is something
to be thoroughly experienced, studied, and
contemplated. 

For Wordsworth, nature is an essential, not
an extra or hobby.  Humans should attempt to be one with nature and cannot fully
experience life without it. 

For instance, in "The World Is
Too Much With Us," Wordsworth presents the idea that people spend too much time dealing
with business and commerce.  He argues that he would rather suffer with an outdated
philosophy and be aware of nature, than to follow a contemporary, up-to-date philosophy,
and not be aware of nature.  Nature, then, is more important to a human than philosophy
or religion, according to Wordsworth.

In "Tintern Abbey,"
Wordsworth demonstrates how he experiences nature, contemplates it over a long period of
time, and learns from it in the process.  The poem actually highlights his writing
process.  He experiences the area around Tintern Abbey five years previous to the poem,
contemplates it during those five years, returns to the area, and writes about both
visits.  This demonstrates Wordsworth's famous idea that poetry is written during
periods of reflection and contemplation, after nature is
experienced. 

Nature is an essential to Wordsworth in these
poems.