Best planning tip you will ever receive (not so good for "organic" forts):
Every room, corridor, construction, etc., should be an odd number of tiles wide. This allows for symmetry in the fortress, as furniture takes up only 1 tile, everything can be centred perfectly. 3-tile wide corridors are sufficient for most purposes, 5-tile ones can be used in ultra-high traffic areas. 11x11 blocks (designated quickly just by pressing shift and a diagonal direction) are extremely versatile - they can be a perfect-sized dining room, a group of 6 walled workshops and a corridor between them, a block of 16 2x2 rooms with stair access at the four inner corners, a block of 4 5x5 rooms suitable as a noble's house. Unfortunately I lost my fortress to an orc invasion and am currently generating a new world, however when I have a fortress running, I shall show you the power of 11x11!
One of the best things about 11x11 is that you can easily use it as a feeder storeroom (or output storage) for several 5x5 workshops, like so:
ww
wEEw
wEEw
hhhhhh
or
hhhhhh
EEwEEw
EEwEEw
wwwwww
Where "w" is a 5x5 workshop, "E" is part of an 11x11 room, "h" is a major hallway, and all rooms are separated by a single wall thickness. 5x5 is great because you can center any 3x3 workshop in it and know that it will be accessible; you can use the 16 tiles around the workshop for storing whatever that workshop produces, and the 11x11 room in the middle for holding input items. So you could use an 11x11 room for storing wood and then surround it with a bowyer's shop, a carpenter's shop, some craftsdwarf shops, or whatever you like.
An 11x11 stockpile limited to sweet pod storage could be surrounded with a farmer's workshop, a 5x5 barrel storage, a 5x5 bag storage, a kitchen, a room with a quern, and a still. Use the "output" stockpiles to hold Dwarven Syrup, Dwarven Sugar, Dwarven Rum, and any meals... and then tell another food stockpile near your Dining Hall to take from all of the intermediate piles.
An 11x11 for pig tails, rope reeds, and any of the dye plants could have a Farmer's Workshop, a Loom, a Clothier, a Dyer, and some 5x5 finished goods stockpiles... or you could invert the process and make the 11x11 hold finished goods. Then the floor space near the FW could hold pig tails and rope reeds; the floor space near the loom would hold thread; the floor space near the dyer would hold dye; and the floor space near the clothier would hold cloth. With enough barrels and bins, and dedicated dwarves, you could minimize the hauling distance for related jobs, while keeping your fort well organized.
You can see me starting to take advantage of tiled 11x11 rooms in
this fort and to a lesser extent in
this one (although if you look closely you'll notice the food layout is based on tiled 5x5 plots).