There are a lot of people living in the world today who aren't even here. Most of their attention is focused on memories of the past, projections into the future, fantasies of alternate worlds, or on themselves. To the degree they diminish their awareness of the present moment during such ruminations, their power and effectiveness in the present also decreases.
When done occasionally or cyclically for relaxation, recreation, inspiration, planning, or self-development there can be great benefit in withdrawing from the present world, but there is a point of diminishing returns which varies with individuals if such focus is carried on for extended periods.
What does it mean to focus on the sensory present and what are the effects of doing that?
It means being more and more consciously aware of the input from your senses. So few people practice real sensory awareness that it is sometimes taught as a meditation technique, and some people do it so well quite unconsciously that they have a profound impact on others around them without even trying. The effects occur as a result of the principle that energy flows where attention goes.
As you place more and more attention on the input from your senses, you may progress through experiences of heightened sensory acuity, relaxation, awareness of energy flow in and around you, awareness of more happening around you than you usually notice... all the way to an increasing realization of the dreamlike quality of physical reality and an awareness of becoming lucid in the dream.
Some of it may frighten you with its strangeness, and some of it may cause you to feel like bursting with joy. On the other hand, a halfhearted effort will probably just make you feel bored.