Absolutely. The problem is running the cable; as bknight mentioned drilling holes aren't an option for him, or for many other people. That's why the various no-cable options, despite their significant drawbacks, are so popular.
I'm bothered by your indication that other devices hooked into the power, washer, dryer, microwave, oven, stovetop in addition to all the internet devices, causing interference or degradation of signal. The primary goal is to have a more stable connection.
Thing is, as you've found, WiFi isn't any better. It can be interfered with by nearby WiFi networks, cordless phones (especially in the 2.4GHz range, some cordless phones use that band), microwaves, or anything that leaks EMI at the right frequencies. It looks like you've found this out the hard way, although it still hasn't been absolutely established that the WiFi is really the issue.
WiFi also has had, and continues to have, security issues (if you use WPA2 you're
probably safe, though). Do
not use WEP, avoid WPA, and also try to avoid the push-button connect called WPS (it has loopholes that basically can't be closed, from what I understand).
When Ethernet over Powerline works, it's usually better than WiFi. But there are conditions that you won't know until you try it. Interference from appliances depends on the appliance; old devices tend to generate more noise. House mains wiring also depends on age; wiring decades old (thirty, forty, more) is also more likely to have issues. If you can find someplace with a no-questions-asked full refund policy, and you think you could manage with a cable for your laptop in a farther room, you can give it a try; otherwise I'd suggest trying to see what can be done about your WiFi.
Bottom line, as
ka9q points out, is that really any solution other than cables has significant operational drawbacks. Cable, though, has installation issues that the others don't, and as you say it's not an option for you (or for most other home owners, for that matter).
