From my own experience, walking meditation takes just as much effort and practice as sitting meditation - you probably won't get much benefit out of it if you don't at least do a little bit every day. Doing a small session before you sit is a great way to calm the mind and get it ready for the more intense concentration of traditional on-the-cushion meditation..
Gain and loss, status and disgrace,
censure and praise, pleasure and pain:
these conditions among human beings are inconstant,
impermanent, subject to change.
Knowing this, the wise person, mindful,
ponders these changing conditions.
Desirable things don’t charm the mind,
undesirable ones bring no resistance.
His welcoming and rebelling are scattered,
gone to their end,
do not exist.
- Lokavipatti Sutta