I do agree with Matt Cheplic. It happened with me. On first thoughts, this poem give you an impression that 'Take the road less traveled and you'll thank yourself one day.'
On reading again and again, you come to understand that (as Matt Cheplic commented) the poem explores the inevitable feeling of regret we will all encounter when we wonder about the path we didn't take.
This is a poet's poem. Great poems are written when a poet reflects back on small things in life.
Consider these two lines,
' I gazed-and gazed-but little thought
What wealth the show to me had brought: '
This is a small moment in the poet's life which he enjoyed. In our life too, there are small moments which we have enjoyed without realising what wealth it had brought to us.
Now consider the following lines:
'For oft, when on my couch I lie
......And dances with the daffodils. '
There are times when we sit vacantly or in a pensive mood and suddenly such small moments flash back into your mind and brings a certain happiness in you.
It could be anything, like playing with your father or mother or child or fighting with your sister or brother for a chocolate and grabbing and eating it. You may have forgotten those moments now, but when are you sitting alone, sometimes you recollect those moments and your heart flutters a bit more. Many of us enjoy such moments, such flashes, into your mind and our life becomes bit more pleasant to live on.