Why did you get into mapping?
When I was like 10 or 11 I think, I found out that you could make maps for Duke Nukem 3D. I grabbed the map editor and made a square room with random textures and put a stripper in the middle.
While I had been programming and making games before then (using a game/program called ZZT), it was at that exact moment that I decided I wanted to make games for the rest of my life.
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I used to make some really shitty deathmatch maps for Unreal Tournament 2004 back in the day. Now I just yell at people and make youtube videos when I get hilariously drunk.
I wanted to see what I could do to expand puzzles with the elements already available in Portal 2.
I also wanted to make chambers/worlds that was in my head into something I could interact with.
I first tried it because of a CS map maker called Buck Nasty. It didn't go well, but I tried again following the release of PTI, which has gotten me to where I am now.
I also found lots of maps made by other people for portal and I wanted to make maps too. So I started learning to use hammer.
I wanted to do something creative and I am quite bad at drawing and writing so mapping was a one way to do it 
Your pain... I feel it!
http://www.tophattwaffle.com/ - My site for Source Engine Level Design
http://therewillbescience.com/ - Portal 2, Lab Rat
http://www.moddb.com/mods/portal-2-lab-rat - Portal 2, Lab Rat (MODDB)
I first had Portal on The Orange Box for the Xbox 360. I feel in love with this game, and after some searching, I found that PC users can make and share maps. Sounded fun. Got a copy for the PC which at the time was a piece of garbage, and eventually got into PC gaming in general. Yet, I still mod/create more then I play.
That was 5 years ago, and now I'm finding just mapping is getting stale. With tools being more broken which each game, and more limits being applied, I find it just pointless for me to just map and make textures for a game that is finished. I've begun working with the Source code, and creating entities which was a breath of fresh air. Now I was coding and using my own entities to create something, and it kept me busy. But when most of it is done, it is just the mapping that is left to do. 
In general, I mapped because it made me feel smart when something worked, and there was always a step to climb. I became a psychopath at the I/O system to a point were I did some ridiculous things. Now I fear that I'm near the top of the stair case.
The more you give, the less appreciated it will be received.
Well, i watched yours (and a lot of others) tutorials and solved to try make maps for cs or hl2, but i never came up with a good idea for it 
so one day after have played portal 2 i played some custom maps and solved to waste some time playing with the authoring tools, fortunatlelly something good popped up, and since then mapping is a wonderful hobby for me 
.
Ps: btw, why did you stopped to make tutorials = ?
My story. Except I put a bazillion enemies.
I've always opened the editor to play with it if it had one. My first proper map was made in the first Call of Duty (United Offensive). Though I never could release them because I didn't have any internet.