I find using the various APIs (Xively, Thingspeak, etc.) to be too difficult for me. Try as I might, I spend hours getting things to work, and I often have to give up. I'd love, for instance, to get graphs of things like temperature and humidity, but have had limited success. I tried IFTTT to collect data from temp and humidity and send to a google spreadsheet for graphing, but IFTTT only allows threshold events (like if the temp rises above x, then log it on a spreadsheet) for temp and humidity.
For me, some of the promise of IOT is gathering data you can use--energy use, for example--not just turning things on and off. And gathering data includes representing it visually for those of us who find combing through logs tedious.